| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright(c) 2013 - 2018 Intel Corporation. */ |
| |
| #include <linux/prefetch.h> |
| #include <net/busy_poll.h> |
| #include <linux/bpf_trace.h> |
| #include <net/xdp.h> |
| #include <asm/msr.h> |
| #include "i40e.h" |
| #include "i40e_trace.h" |
| #include "i40e_prototype.h" |
| |
| static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size, |
| u32 td_tag) |
| { |
| return cpu_to_le64(I40E_TX_DESC_DTYPE_DATA | |
| ((u64)td_cmd << I40E_TXD_QW1_CMD_SHIFT) | |
| ((u64)td_offset << I40E_TXD_QW1_OFFSET_SHIFT) | |
| ((u64)size << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) | |
| ((u64)td_tag << I40E_TXD_QW1_L2TAG1_SHIFT)); |
| } |
| |
| #define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS) |
| /** |
| * i40e_fdir - Generate a Flow Director descriptor based on fdata |
| * @tx_ring: Tx ring to send buffer on |
| * @fdata: Flow director filter data |
| * @add: Indicate if we are adding a rule or deleting one |
| * |
| **/ |
| static void i40e_fdir(struct i40e_ring *tx_ring, |
| struct i40e_fdir_filter *fdata, bool add) |
| { |
| struct i40e_filter_program_desc *fdir_desc; |
| struct i40e_pf *pf = tx_ring->vsi->back; |
| u32 flex_ptype, dtype_cmd; |
| u16 i; |
| |
| /* grab the next descriptor */ |
| i = tx_ring->next_to_use; |
| fdir_desc = I40E_TX_FDIRDESC(tx_ring, i); |
| |
| i++; |
| tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; |
| |
| flex_ptype = I40E_TXD_FLTR_QW0_QINDEX_MASK & |
| (fdata->q_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT); |
| |
| flex_ptype |= I40E_TXD_FLTR_QW0_FLEXOFF_MASK & |
| (fdata->flex_off << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT); |
| |
| flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK & |
| (fdata->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT); |
| |
| flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK & |
| (fdata->flex_offset << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT); |
| |
| /* Use LAN VSI Id if not programmed by user */ |
| flex_ptype |= I40E_TXD_FLTR_QW0_DEST_VSI_MASK & |
| ((u32)(fdata->dest_vsi ? : pf->vsi[pf->lan_vsi]->id) << |
| I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT); |
| |
| dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG; |
| |
| dtype_cmd |= add ? |
| I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE << |
| I40E_TXD_FLTR_QW1_PCMD_SHIFT : |
| I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE << |
| I40E_TXD_FLTR_QW1_PCMD_SHIFT; |
| |
| dtype_cmd |= I40E_TXD_FLTR_QW1_DEST_MASK & |
| (fdata->dest_ctl << I40E_TXD_FLTR_QW1_DEST_SHIFT); |
| |
| dtype_cmd |= I40E_TXD_FLTR_QW1_FD_STATUS_MASK & |
| (fdata->fd_status << I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT); |
| |
| if (fdata->cnt_index) { |
| dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK; |
| dtype_cmd |= I40E_TXD_FLTR_QW1_CNTINDEX_MASK & |
| ((u32)fdata->cnt_index << |
| I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT); |
| } |
| |
| fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype); |
| fdir_desc->rsvd = cpu_to_le32(0); |
| fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd); |
| fdir_desc->fd_id = cpu_to_le32(fdata->fd_id); |
| } |
| |
| #define I40E_FD_CLEAN_DELAY 10 |
| /** |
| * i40e_program_fdir_filter - Program a Flow Director filter |
| * @fdir_data: Packet data that will be filter parameters |
| * @raw_packet: the pre-allocated packet buffer for FDir |
| * @pf: The PF pointer |
| * @add: True for add/update, False for remove |
| **/ |
| static int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data, |
| u8 *raw_packet, struct i40e_pf *pf, |
| bool add) |
| { |
| struct i40e_tx_buffer *tx_buf, *first; |
| struct i40e_tx_desc *tx_desc; |
| struct i40e_ring *tx_ring; |
| struct i40e_vsi *vsi; |
| struct device *dev; |
| dma_addr_t dma; |
| u32 td_cmd = 0; |
| u16 i; |
| |
| /* find existing FDIR VSI */ |
| vsi = i40e_find_vsi_by_type(pf, I40E_VSI_FDIR); |
| if (!vsi) |
| return -ENOENT; |
| |
| tx_ring = vsi->tx_rings[0]; |
| dev = tx_ring->dev; |
| |
| /* we need two descriptors to add/del a filter and we can wait */ |
| for (i = I40E_FD_CLEAN_DELAY; I40E_DESC_UNUSED(tx_ring) < 2; i--) { |
| if (!i) |
| return -EAGAIN; |
| msleep_interruptible(1); |
| } |
| |
| dma = dma_map_single(dev, raw_packet, |
| I40E_FDIR_MAX_RAW_PACKET_SIZE, DMA_TO_DEVICE); |
| if (dma_mapping_error(dev, dma)) |
| goto dma_fail; |
| |
| /* grab the next descriptor */ |
| i = tx_ring->next_to_use; |
| first = &tx_ring->tx_bi[i]; |
| i40e_fdir(tx_ring, fdir_data, add); |
| |
| /* Now program a dummy descriptor */ |
| i = tx_ring->next_to_use; |
| tx_desc = I40E_TX_DESC(tx_ring, i); |
| tx_buf = &tx_ring->tx_bi[i]; |
| |
| tx_ring->next_to_use = ((i + 1) < tx_ring->count) ? i + 1 : 0; |
| |
| memset(tx_buf, 0, sizeof(struct i40e_tx_buffer)); |
| |
| /* record length, and DMA address */ |
| dma_unmap_len_set(tx_buf, len, I40E_FDIR_MAX_RAW_PACKET_SIZE); |
| dma_unmap_addr_set(tx_buf, dma, dma); |
| |
| tx_desc->buffer_addr = cpu_to_le64(dma); |
| td_cmd = I40E_TXD_CMD | I40E_TX_DESC_CMD_DUMMY; |
| |
| tx_buf->tx_flags = I40E_TX_FLAGS_FD_SB; |
| tx_buf->raw_buf = (void *)raw_packet; |
| |
| tx_desc->cmd_type_offset_bsz = |
| build_ctob(td_cmd, 0, I40E_FDIR_MAX_RAW_PACKET_SIZE, 0); |
| |
| /* Force memory writes to complete before letting h/w |
| * know there are new descriptors to fetch. |
| */ |
| wmb(); |
| |
| /* Mark the data descriptor to be watched */ |
| first->next_to_watch = tx_desc; |
| |
| writel(tx_ring->next_to_use, tx_ring->tail); |
| return 0; |
| |
| dma_fail: |
| return -1; |
| } |
| |
| #define IP_HEADER_OFFSET 14 |
| #define I40E_UDPIP_DUMMY_PACKET_LEN 42 |
| /** |
| * i40e_add_del_fdir_udpv4 - Add/Remove UDPv4 filters |
| * @vsi: pointer to the targeted VSI |
| * @fd_data: the flow director data required for the FDir descriptor |
| * @add: true adds a filter, false removes it |
| * |
| * Returns 0 if the filters were successfully added or removed |
| **/ |
| static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi, |
| struct i40e_fdir_filter *fd_data, |
| bool add) |
| { |
| struct i40e_pf *pf = vsi->back; |
| struct udphdr *udp; |
| struct iphdr *ip; |
| u8 *raw_packet; |
| int ret; |
| static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, |
| 0x45, 0, 0, 0x1c, 0, 0, 0x40, 0, 0x40, 0x11, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; |
| |
| raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
| if (!raw_packet) |
| return -ENOMEM; |
| memcpy(raw_packet, packet, I40E_UDPIP_DUMMY_PACKET_LEN); |
| |
| ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); |
| udp = (struct udphdr *)(raw_packet + IP_HEADER_OFFSET |
| + sizeof(struct iphdr)); |
| |
| ip->daddr = fd_data->dst_ip; |
| udp->dest = fd_data->dst_port; |
| ip->saddr = fd_data->src_ip; |
| udp->source = fd_data->src_port; |
| |
| if (fd_data->flex_filter) { |
| u8 *payload = raw_packet + I40E_UDPIP_DUMMY_PACKET_LEN; |
| __be16 pattern = fd_data->flex_word; |
| u16 off = fd_data->flex_offset; |
| |
| *((__force __be16 *)(payload + off)) = pattern; |
| } |
| |
| fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_UDP; |
| ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); |
| if (ret) { |
| dev_info(&pf->pdev->dev, |
| "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
| fd_data->pctype, fd_data->fd_id, ret); |
| /* Free the packet buffer since it wasn't added to the ring */ |
| kfree(raw_packet); |
| return -EOPNOTSUPP; |
| } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
| if (add) |
| dev_info(&pf->pdev->dev, |
| "Filter OK for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| else |
| dev_info(&pf->pdev->dev, |
| "Filter deleted for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| } |
| |
| if (add) |
| pf->fd_udp4_filter_cnt++; |
| else |
| pf->fd_udp4_filter_cnt--; |
| |
| return 0; |
| } |
| |
| #define I40E_TCPIP_DUMMY_PACKET_LEN 54 |
| /** |
| * i40e_add_del_fdir_tcpv4 - Add/Remove TCPv4 filters |
| * @vsi: pointer to the targeted VSI |
| * @fd_data: the flow director data required for the FDir descriptor |
| * @add: true adds a filter, false removes it |
| * |
| * Returns 0 if the filters were successfully added or removed |
| **/ |
| static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi, |
| struct i40e_fdir_filter *fd_data, |
| bool add) |
| { |
| struct i40e_pf *pf = vsi->back; |
| struct tcphdr *tcp; |
| struct iphdr *ip; |
| u8 *raw_packet; |
| int ret; |
| /* Dummy packet */ |
| static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, |
| 0x45, 0, 0, 0x28, 0, 0, 0x40, 0, 0x40, 0x6, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x11, |
| 0x0, 0x72, 0, 0, 0, 0}; |
| |
| raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
| if (!raw_packet) |
| return -ENOMEM; |
| memcpy(raw_packet, packet, I40E_TCPIP_DUMMY_PACKET_LEN); |
| |
| ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); |
| tcp = (struct tcphdr *)(raw_packet + IP_HEADER_OFFSET |
| + sizeof(struct iphdr)); |
| |
| ip->daddr = fd_data->dst_ip; |
| tcp->dest = fd_data->dst_port; |
| ip->saddr = fd_data->src_ip; |
| tcp->source = fd_data->src_port; |
| |
| if (fd_data->flex_filter) { |
| u8 *payload = raw_packet + I40E_TCPIP_DUMMY_PACKET_LEN; |
| __be16 pattern = fd_data->flex_word; |
| u16 off = fd_data->flex_offset; |
| |
| *((__force __be16 *)(payload + off)) = pattern; |
| } |
| |
| fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP; |
| ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); |
| if (ret) { |
| dev_info(&pf->pdev->dev, |
| "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
| fd_data->pctype, fd_data->fd_id, ret); |
| /* Free the packet buffer since it wasn't added to the ring */ |
| kfree(raw_packet); |
| return -EOPNOTSUPP; |
| } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
| if (add) |
| dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d loc = %d)\n", |
| fd_data->pctype, fd_data->fd_id); |
| else |
| dev_info(&pf->pdev->dev, |
| "Filter deleted for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| } |
| |
| if (add) { |
| pf->fd_tcp4_filter_cnt++; |
| if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) && |
| I40E_DEBUG_FD & pf->hw.debug_mask) |
| dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n"); |
| set_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state); |
| } else { |
| pf->fd_tcp4_filter_cnt--; |
| } |
| |
| return 0; |
| } |
| |
| #define I40E_SCTPIP_DUMMY_PACKET_LEN 46 |
| /** |
| * i40e_add_del_fdir_sctpv4 - Add/Remove SCTPv4 Flow Director filters for |
| * a specific flow spec |
| * @vsi: pointer to the targeted VSI |
| * @fd_data: the flow director data required for the FDir descriptor |
| * @add: true adds a filter, false removes it |
| * |
| * Returns 0 if the filters were successfully added or removed |
| **/ |
| static int i40e_add_del_fdir_sctpv4(struct i40e_vsi *vsi, |
| struct i40e_fdir_filter *fd_data, |
| bool add) |
| { |
| struct i40e_pf *pf = vsi->back; |
| struct sctphdr *sctp; |
| struct iphdr *ip; |
| u8 *raw_packet; |
| int ret; |
| /* Dummy packet */ |
| static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, |
| 0x45, 0, 0, 0x20, 0, 0, 0x40, 0, 0x40, 0x84, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; |
| |
| raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
| if (!raw_packet) |
| return -ENOMEM; |
| memcpy(raw_packet, packet, I40E_SCTPIP_DUMMY_PACKET_LEN); |
| |
| ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); |
| sctp = (struct sctphdr *)(raw_packet + IP_HEADER_OFFSET |
| + sizeof(struct iphdr)); |
| |
| ip->daddr = fd_data->dst_ip; |
| sctp->dest = fd_data->dst_port; |
| ip->saddr = fd_data->src_ip; |
| sctp->source = fd_data->src_port; |
| |
| if (fd_data->flex_filter) { |
| u8 *payload = raw_packet + I40E_SCTPIP_DUMMY_PACKET_LEN; |
| __be16 pattern = fd_data->flex_word; |
| u16 off = fd_data->flex_offset; |
| |
| *((__force __be16 *)(payload + off)) = pattern; |
| } |
| |
| fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_SCTP; |
| ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); |
| if (ret) { |
| dev_info(&pf->pdev->dev, |
| "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
| fd_data->pctype, fd_data->fd_id, ret); |
| /* Free the packet buffer since it wasn't added to the ring */ |
| kfree(raw_packet); |
| return -EOPNOTSUPP; |
| } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
| if (add) |
| dev_info(&pf->pdev->dev, |
| "Filter OK for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| else |
| dev_info(&pf->pdev->dev, |
| "Filter deleted for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| } |
| |
| if (add) |
| pf->fd_sctp4_filter_cnt++; |
| else |
| pf->fd_sctp4_filter_cnt--; |
| |
| return 0; |
| } |
| |
| #define I40E_IP_DUMMY_PACKET_LEN 34 |
| /** |
| * i40e_add_del_fdir_ipv4 - Add/Remove IPv4 Flow Director filters for |
| * a specific flow spec |
| * @vsi: pointer to the targeted VSI |
| * @fd_data: the flow director data required for the FDir descriptor |
| * @add: true adds a filter, false removes it |
| * |
| * Returns 0 if the filters were successfully added or removed |
| **/ |
| static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi, |
| struct i40e_fdir_filter *fd_data, |
| bool add) |
| { |
| struct i40e_pf *pf = vsi->back; |
| struct iphdr *ip; |
| u8 *raw_packet; |
| int ret; |
| int i; |
| static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, |
| 0x45, 0, 0, 0x14, 0, 0, 0x40, 0, 0x40, 0x10, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0}; |
| |
| for (i = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER; |
| i <= I40E_FILTER_PCTYPE_FRAG_IPV4; i++) { |
| raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
| if (!raw_packet) |
| return -ENOMEM; |
| memcpy(raw_packet, packet, I40E_IP_DUMMY_PACKET_LEN); |
| ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); |
| |
| ip->saddr = fd_data->src_ip; |
| ip->daddr = fd_data->dst_ip; |
| ip->protocol = 0; |
| |
| if (fd_data->flex_filter) { |
| u8 *payload = raw_packet + I40E_IP_DUMMY_PACKET_LEN; |
| __be16 pattern = fd_data->flex_word; |
| u16 off = fd_data->flex_offset; |
| |
| *((__force __be16 *)(payload + off)) = pattern; |
| } |
| |
| fd_data->pctype = i; |
| ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); |
| if (ret) { |
| dev_info(&pf->pdev->dev, |
| "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
| fd_data->pctype, fd_data->fd_id, ret); |
| /* The packet buffer wasn't added to the ring so we |
| * need to free it now. |
| */ |
| kfree(raw_packet); |
| return -EOPNOTSUPP; |
| } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
| if (add) |
| dev_info(&pf->pdev->dev, |
| "Filter OK for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| else |
| dev_info(&pf->pdev->dev, |
| "Filter deleted for PCTYPE %d loc = %d\n", |
| fd_data->pctype, fd_data->fd_id); |
| } |
| } |
| |
| if (add) |
| pf->fd_ip4_filter_cnt++; |
| else |
| pf->fd_ip4_filter_cnt--; |
| |
| return 0; |
| } |
| |
| /** |
| * i40e_add_del_fdir - Build raw packets to add/del fdir filter |
| * @vsi: pointer to the targeted VSI |
| * @input: filter to add or delete |
| * @add: true adds a filter, false removes it |
| * |
| **/ |
| int i40e_add_del_fdir(struct i40e_vsi *vsi, |
| struct i40e_fdir_filter *input, bool add) |
| { |
| struct i40e_pf *pf = vsi->back; |
| int ret; |
| |
| switch (input->flow_type & ~FLOW_EXT) { |
| case TCP_V4_FLOW: |
| ret = i40e_add_del_fdir_tcpv4(vsi, input, add); |
| break; |
| case UDP_V4_FLOW: |
| ret = i40e_add_del_fdir_udpv4(vsi, input, add); |
| break; |
| case SCTP_V4_FLOW: |
| ret = i40e_add_del_fdir_sctpv4(vsi, input, add); |
| break; |
| case IP_USER_FLOW: |
| switch (input->ip4_proto) { |
| case IPPROTO_TCP: |
| ret = i40e_add_del_fdir_tcpv4(vsi, input, add); |
| break; |
| case IPPROTO_UDP: |
| ret = i40e_add_del_fdir_udpv4(vsi, input, add); |
| break; |
| case IPPROTO_SCTP: |
| ret = i40e_add_del_fdir_sctpv4(vsi, input, add); |
| break; |
| case IPPROTO_IP: |
| ret = i40e_add_del_fdir_ipv4(vsi, input, add); |
| break; |
| default: |
| /* We cannot support masking based on protocol */ |
| dev_info(&pf->pdev->dev, "Unsupported IPv4 protocol 0x%02x\n", |
| input->ip4_proto); |
| return -EINVAL; |
| } |
| break; |
| default: |
| dev_info(&pf->pdev->dev, "Unsupported flow type 0x%02x\n", |
| input->flow_type); |
| return -EINVAL; |
| } |
| |
| /* The buffer allocated here will be normally be freed by |
| * i40e_clean_fdir_tx_irq() as it reclaims resources after transmit |
| * completion. In the event of an error adding the buffer to the FDIR |
| * ring, it will immediately be freed. It may also be freed by |
| * i40e_clean_tx_ring() when closing the VSI. |
| */ |
| return ret; |
| } |
| |
| /** |
| * i40e_fd_handle_status - check the Programming Status for FD |
| * @rx_ring: the Rx ring for this descriptor |
| * @rx_desc: the Rx descriptor for programming Status, not a packet descriptor. |
| * @prog_id: the id originally used for programming |
| * |
| * This is used to verify if the FD programming or invalidation |
| * requested by SW to the HW is successful or not and take actions accordingly. |
| **/ |
| static void i40e_fd_handle_status(struct i40e_ring *rx_ring, |
| union i40e_rx_desc *rx_desc, u8 prog_id) |
| { |
| struct i40e_pf *pf = rx_ring->vsi->back; |
| struct pci_dev *pdev = pf->pdev; |
| u32 fcnt_prog, fcnt_avail; |
| u32 error; |
| u64 qw; |
| |
| qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >> |
| I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT; |
| |
| if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) { |
| pf->fd_inv = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fd_id); |
| if ((rx_desc->wb.qword0.hi_dword.fd_id != 0) || |
| (I40E_DEBUG_FD & pf->hw.debug_mask)) |
| dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n", |
| pf->fd_inv); |
| |
| /* Check if the programming error is for ATR. |
| * If so, auto disable ATR and set a state for |
| * flush in progress. Next time we come here if flush is in |
| * progress do nothing, once flush is complete the state will |
| * be cleared. |
| */ |
| if (test_bit(__I40E_FD_FLUSH_REQUESTED, pf->state)) |
| return; |
| |
| pf->fd_add_err++; |
| /* store the current atr filter count */ |
| pf->fd_atr_cnt = i40e_get_current_atr_cnt(pf); |
| |
| if ((rx_desc->wb.qword0.hi_dword.fd_id == 0) && |
| test_bit(__I40E_FD_SB_AUTO_DISABLED, pf->state)) { |
| /* These set_bit() calls aren't atomic with the |
| * test_bit() here, but worse case we potentially |
| * disable ATR and queue a flush right after SB |
| * support is re-enabled. That shouldn't cause an |
| * issue in practice |
| */ |
| set_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state); |
| set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state); |
| } |
| |
| /* filter programming failed most likely due to table full */ |
| fcnt_prog = i40e_get_global_fd_count(pf); |
| fcnt_avail = pf->fdir_pf_filter_count; |
| /* If ATR is running fcnt_prog can quickly change, |
| * if we are very close to full, it makes sense to disable |
| * FD ATR/SB and then re-enable it when there is room. |
| */ |
| if (fcnt_prog >= (fcnt_avail - I40E_FDIR_BUFFER_FULL_MARGIN)) { |
| if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) && |
| !test_and_set_bit(__I40E_FD_SB_AUTO_DISABLED, |
| pf->state)) |
| if (I40E_DEBUG_FD & pf->hw.debug_mask) |
| dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n"); |
| } |
| } else if (error == BIT(I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) { |
| if (I40E_DEBUG_FD & pf->hw.debug_mask) |
| dev_info(&pdev->dev, "ntuple filter fd_id = %d, could not be removed\n", |
| rx_desc->wb.qword0.hi_dword.fd_id); |
| } |
| } |
| |
| /** |
| * i40e_unmap_and_free_tx_resource - Release a Tx buffer |
| * @ring: the ring that owns the buffer |
| * @tx_buffer: the buffer to free |
| **/ |
| static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring, |
| struct i40e_tx_buffer *tx_buffer) |
| { |
| if (tx_buffer->skb) { |
| if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB) |
| kfree(tx_buffer->raw_buf); |
| else if (ring_is_xdp(ring)) |
| xdp_return_frame(tx_buffer->xdpf); |
| else |
| dev_kfree_skb_any(tx_buffer->skb); |
| if (dma_unmap_len(tx_buffer, len)) |
| dma_unmap_single(ring->dev, |
| dma_unmap_addr(tx_buffer, dma), |
| dma_unmap_len(tx_buffer, len), |
| DMA_TO_DEVICE); |
| } else if (dma_unmap_len(tx_buffer, len)) { |
| dma_unmap_page(ring->dev, |
| dma_unmap_addr(tx_buffer, dma), |
| dma_unmap_len(tx_buffer, len), |
| DMA_TO_DEVICE); |
| } |
| |
| tx_buffer->next_to_watch = NULL; |
| tx_buffer->skb = NULL; |
| dma_unmap_len_set(tx_buffer, len, 0); |
| /* tx_buffer must be completely set up in the transmit path */ |
| } |
| |
| /** |
| * i40e_clean_tx_ring - Free any empty Tx buffers |
| * @tx_ring: ring to be cleaned |
| **/ |
| void i40e_clean_tx_ring(struct i40e_ring *tx_ring) |
| { |
| unsigned long bi_size; |
| u16 i; |
| |
| /* ring already cleared, nothing to do */ |
| if (!tx_ring->tx_bi) |
| return; |
| |
| /* Free all the Tx ring sk_buffs */ |
| for (i = 0; i < tx_ring->count; i++) |
| i40e_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]); |
| |
| bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; |
| memset(tx_ring->tx_bi, 0, bi_size); |
| |
| /* Zero out the descriptor ring */ |
| memset(tx_ring->desc, 0, tx_ring->size); |
| |
| tx_ring->next_to_use = 0; |
| tx_ring->next_to_clean = 0; |
| |
| if (!tx_ring->netdev) |
| return; |
| |
| /* cleanup Tx queue statistics */ |
| netdev_tx_reset_queue(txring_txq(tx_ring)); |
| } |
| |
| /** |
| * i40e_free_tx_resources - Free Tx resources per queue |
| * @tx_ring: Tx descriptor ring for a specific queue |
| * |
| * Free all transmit software resources |
| **/ |
| void i40e_free_tx_resources(struct i40e_ring *tx_ring) |
| { |
| i40e_clean_tx_ring(tx_ring); |
| kfree(tx_ring->tx_bi); |
| tx_ring->tx_bi = NULL; |
| |
| if (tx_ring->desc) { |
| dma_free_coherent(tx_ring->dev, tx_ring->size, |
| tx_ring->desc, tx_ring->dma); |
| tx_ring->desc = NULL; |
| } |
| } |
| |
| /** |
| * i40e_get_tx_pending - how many tx descriptors not processed |
| * @ring: the ring of descriptors |
| * @in_sw: use SW variables |
| * |
| * Since there is no access to the ring head register |
| * in XL710, we need to use our local copies |
| **/ |
| u32 i40e_get_tx_pending(struct i40e_ring *ring, bool in_sw) |
| { |
| u32 head, tail; |
| |
| if (!in_sw) { |
| head = i40e_get_head(ring); |
| tail = readl(ring->tail); |
| } else { |
| head = ring->next_to_clean; |
| tail = ring->next_to_use; |
| } |
| |
| if (head != tail) |
| return (head < tail) ? |
| tail - head : (tail + ring->count - head); |
| |
| return 0; |
| } |
| |
| /** |
| * i40e_detect_recover_hung - Function to detect and recover hung_queues |
| * @vsi: pointer to vsi struct with tx queues |
| * |
| * VSI has netdev and netdev has TX queues. This function is to check each of |
| * those TX queues if they are hung, trigger recovery by issuing SW interrupt. |
| **/ |
| void i40e_detect_recover_hung(struct i40e_vsi *vsi) |
| { |
| struct i40e_ring *tx_ring = NULL; |
| struct net_device *netdev; |
| unsigned int i; |
| int packets; |
| |
| if (!vsi) |
| return; |
| |
| if (test_bit(__I40E_VSI_DOWN, vsi->state)) |
| return; |
| |
| netdev = vsi->netdev; |
| if (!netdev) |
| return; |
| |
| if (!netif_carrier_ok(netdev)) |
| return; |
| |
| for (i = 0; i < vsi->num_queue_pairs; i++) { |
| tx_ring = vsi->tx_rings[i]; |
| if (tx_ring && tx_ring->desc) { |
| /* If packet counter has not changed the queue is |
| * likely stalled, so force an interrupt for this |
| * queue. |
| * |
| * prev_pkt_ctr would be negative if there was no |
| * pending work. |
| */ |
| packets = tx_ring->stats.packets & INT_MAX; |
| if (tx_ring->tx_stats.prev_pkt_ctr == packets) { |
| i40e_force_wb(vsi, tx_ring->q_vector); |
| continue; |
| } |
| |
| /* Memory barrier between read of packet count and call |
| * to i40e_get_tx_pending() |
| */ |
| smp_rmb(); |
| tx_ring->tx_stats.prev_pkt_ctr = |
| i40e_get_tx_pending(tx_ring, true) ? packets : -1; |
| } |
| } |
| } |
| |
| #define WB_STRIDE 4 |
| |
| /** |
| * i40e_clean_tx_irq - Reclaim resources after transmit completes |
| * @vsi: the VSI we care about |
| * @tx_ring: Tx ring to clean |
| * @napi_budget: Used to determine if we are in netpoll |
| * |
| * Returns true if there's any budget left (e.g. the clean is finished) |
| **/ |
| static bool i40e_clean_tx_irq(struct i40e_vsi *vsi, |
| struct i40e_ring *tx_ring, int napi_budget) |
| { |
| u16 i = tx_ring->next_to_clean; |
| struct i40e_tx_buffer *tx_buf; |
| struct i40e_tx_desc *tx_head; |
| struct i40e_tx_desc *tx_desc; |
| unsigned int total_bytes = 0, total_packets = 0; |
| unsigned int budget = vsi->work_limit; |
| |
| tx_buf = &tx_ring->tx_bi[i]; |
| tx_desc = I40E_TX_DESC(tx_ring, i); |
| i -= tx_ring->count; |
| |
| tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring)); |
| |
| do { |
| struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch; |
| |
| /* if next_to_watch is not set then there is no work pending */ |
| if (!eop_desc) |
| break; |
| |
| /* prevent any other reads prior to eop_desc */ |
| smp_rmb(); |
| |
| i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf); |
| /* we have caught up to head, no work left to do */ |
| if (tx_head == tx_desc) |
| break; |
| |
| /* clear next_to_watch to prevent false hangs */ |
| tx_buf->next_to_watch = NULL; |
| |
| /* update the statistics for this packet */ |
| total_bytes += tx_buf->bytecount; |
| total_packets += tx_buf->gso_segs; |
| |
| /* free the skb/XDP data */ |
| if (ring_is_xdp(tx_ring)) |
| xdp_return_frame(tx_buf->xdpf); |
| else |
| napi_consume_skb(tx_buf->skb, napi_budget); |
| |
| /* unmap skb header data */ |
| dma_unmap_single(tx_ring->dev, |
| dma_unmap_addr(tx_buf, dma), |
| dma_unmap_len(tx_buf, len), |
| DMA_TO_DEVICE); |
| |
| /* clear tx_buffer data */ |
| tx_buf->skb = NULL; |
| dma_unmap_len_set(tx_buf, len, 0); |
| |
| /* unmap remaining buffers */ |
| while (tx_desc != eop_desc) { |
| i40e_trace(clean_tx_irq_unmap, |
| tx_ring, tx_desc, tx_buf); |
| |
| tx_buf++; |
| tx_desc++; |
| i++; |
| if (unlikely(!i)) { |
| i -= tx_ring->count; |
| tx_buf = tx_ring->tx_bi; |
| tx_desc = I40E_TX_DESC(tx_ring, 0); |
| } |
| |
| /* unmap any remaining paged data */ |
| if (dma_unmap_len(tx_buf, len)) { |
| dma_unmap_page(tx_ring->dev, |
| dma_unmap_addr(tx_buf, dma), |
| dma_unmap_len(tx_buf, len), |
| DMA_TO_DEVICE); |
| dma_unmap_len_set(tx_buf, len, 0); |
| } |
| } |
| |
| /* move us one more past the eop_desc for start of next pkt */ |
| tx_buf++; |
| tx_desc++; |
| i++; |
| if (unlikely(!i)) { |
| i -= tx_ring->count; |
| tx_buf = tx_ring->tx_bi; |
| tx_desc = I40E_TX_DESC(tx_ring, 0); |
| } |
| |
| prefetch(tx_desc); |
| |
| /* update budget accounting */ |
| budget--; |
| } while (likely(budget)); |
| |
| i += tx_ring->count; |
| tx_ring->next_to_clean = i; |
| u64_stats_update_begin(&tx_ring->syncp); |
| tx_ring->stats.bytes += total_bytes; |
| tx_ring->stats.packets += total_packets; |
| u64_stats_update_end(&tx_ring->syncp); |
| tx_ring->q_vector->tx.total_bytes += total_bytes; |
| tx_ring->q_vector->tx.total_packets += total_packets; |
| |
| if (tx_ring->flags & I40E_TXR_FLAGS_WB_ON_ITR) { |
| /* check to see if there are < 4 descriptors |
| * waiting to be written back, then kick the hardware to force |
| * them to be written back in case we stay in NAPI. |
| * In this mode on X722 we do not enable Interrupt. |
| */ |
| unsigned int j = i40e_get_tx_pending(tx_ring, false); |
| |
| if (budget && |
| ((j / WB_STRIDE) == 0) && (j > 0) && |
| !test_bit(__I40E_VSI_DOWN, vsi->state) && |
| (I40E_DESC_UNUSED(tx_ring) != tx_ring->count)) |
| tx_ring->arm_wb = true; |
| } |
| |
| if (ring_is_xdp(tx_ring)) |
| return !!budget; |
| |
| /* notify netdev of completed buffers */ |
| netdev_tx_completed_queue(txring_txq(tx_ring), |
| total_packets, total_bytes); |
| |
| #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2)) |
| if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) && |
| (I40E_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) { |
| /* Make sure that anybody stopping the queue after this |
| * sees the new next_to_clean. |
| */ |
| smp_mb(); |
| if (__netif_subqueue_stopped(tx_ring->netdev, |
| tx_ring->queue_index) && |
| !test_bit(__I40E_VSI_DOWN, vsi->state)) { |
| netif_wake_subqueue(tx_ring->netdev, |
| tx_ring->queue_index); |
| ++tx_ring->tx_stats.restart_queue; |
| } |
| } |
| |
| return !!budget; |
| } |
| |
| /** |
| * i40e_enable_wb_on_itr - Arm hardware to do a wb, interrupts are not enabled |
| * @vsi: the VSI we care about |
| * @q_vector: the vector on which to enable writeback |
| * |
| **/ |
| static void i40e_enable_wb_on_itr(struct i40e_vsi *vsi, |
| struct i40e_q_vector *q_vector) |
| { |
| u16 flags = q_vector->tx.ring[0].flags; |
| u32 val; |
| |
| if (!(flags & I40E_TXR_FLAGS_WB_ON_ITR)) |
| return; |
| |
| if (q_vector->arm_wb_state) |
| return; |
| |
| if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) { |
| val = I40E_PFINT_DYN_CTLN_WB_ON_ITR_MASK | |
| I40E_PFINT_DYN_CTLN_ITR_INDX_MASK; /* set noitr */ |
| |
| wr32(&vsi->back->hw, |
| I40E_PFINT_DYN_CTLN(q_vector->reg_idx), |
| val); |
| } else { |
| val = I40E_PFINT_DYN_CTL0_WB_ON_ITR_MASK | |
| I40E_PFINT_DYN_CTL0_ITR_INDX_MASK; /* set noitr */ |
| |
| wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val); |
| } |
| q_vector->arm_wb_state = true; |
| } |
| |
| /** |
| * i40e_force_wb - Issue SW Interrupt so HW does a wb |
| * @vsi: the VSI we care about |
| * @q_vector: the vector on which to force writeback |
| * |
| **/ |
| void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector) |
| { |
| if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) { |
| u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK | |
| I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */ |
| I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK | |
| I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK; |
| /* allow 00 to be written to the index */ |
| |
| wr32(&vsi->back->hw, |
| I40E_PFINT_DYN_CTLN(q_vector->reg_idx), val); |
| } else { |
| u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK | |
| I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */ |
| I40E_PFINT_DYN_CTL0_SWINT_TRIG_MASK | |
| I40E_PFINT_DYN_CTL0_SW_ITR_INDX_ENA_MASK; |
| /* allow 00 to be written to the index */ |
| |
| wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val); |
| } |
| } |
| |
| static inline bool i40e_container_is_rx(struct i40e_q_vector *q_vector, |
| struct i40e_ring_container *rc) |
| { |
| return &q_vector->rx == rc; |
| } |
| |
| static inline unsigned int i40e_itr_divisor(struct i40e_q_vector *q_vector) |
| { |
| unsigned int divisor; |
| |
| switch (q_vector->vsi->back->hw.phy.link_info.link_speed) { |
| case I40E_LINK_SPEED_40GB: |
| divisor = I40E_ITR_ADAPTIVE_MIN_INC * 1024; |
| break; |
| case I40E_LINK_SPEED_25GB: |
| case I40E_LINK_SPEED_20GB: |
| divisor = I40E_ITR_ADAPTIVE_MIN_INC * 512; |
| break; |
| default: |
| case I40E_LINK_SPEED_10GB: |
| divisor = I40E_ITR_ADAPTIVE_MIN_INC * 256; |
| break; |
| case I40E_LINK_SPEED_1GB: |
| case I40E_LINK_SPEED_100MB: |
| divisor = I40E_ITR_ADAPTIVE_MIN_INC * 32; |
| break; |
| } |
| |
| return divisor; |
| } |
| |
| /** |
| * i40e_update_itr - update the dynamic ITR value based on statistics |
| * @q_vector: structure containing interrupt and ring information |
| * @rc: structure containing ring performance data |
| * |
| * Stores a new ITR value based on packets and byte |
| * counts during the last interrupt. The advantage of per interrupt |
| * computation is faster updates and more accurate ITR for the current |
| * traffic pattern. Constants in this function were computed |
| * based on theoretical maximum wire speed and thresholds were set based |
| * on testing data as well as attempting to minimize response time |
| * while increasing bulk throughput. |
| **/ |
| static void i40e_update_itr(struct i40e_q_vector *q_vector, |
| struct i40e_ring_container *rc) |
| { |
| unsigned int avg_wire_size, packets, bytes, itr; |
| unsigned long next_update = jiffies; |
| |
| /* If we don't have any rings just leave ourselves set for maximum |
| * possible latency so we take ourselves out of the equation. |
| */ |
| if (!rc->ring || !ITR_IS_DYNAMIC(rc->ring->itr_setting)) |
| return; |
| |
| /* For Rx we want to push the delay up and default to low latency. |
| * for Tx we want to pull the delay down and default to high latency. |
| */ |
| itr = i40e_container_is_rx(q_vector, rc) ? |
| I40E_ITR_ADAPTIVE_MIN_USECS | I40E_ITR_ADAPTIVE_LATENCY : |
| I40E_ITR_ADAPTIVE_MAX_USECS | I40E_ITR_ADAPTIVE_LATENCY; |
| |
| /* If we didn't update within up to 1 - 2 jiffies we can assume |
| * that either packets are coming in so slow there hasn't been |
| * any work, or that there is so much work that NAPI is dealing |
| * with interrupt moderation and we don't need to do anything. |
| */ |
| if (time_after(next_update, rc->next_update)) |
| goto clear_counts; |
| |
| /* If itr_countdown is set it means we programmed an ITR within |
| * the last 4 interrupt cycles. This has a side effect of us |
| * potentially firing an early interrupt. In order to work around |
| * this we need to throw out any data received for a few |
| * interrupts following the update. |
| */ |
| if (q_vector->itr_countdown) { |
| itr = rc->target_itr; |
| goto clear_counts; |
| } |
| |
| packets = rc->total_packets; |
| bytes = rc->total_bytes; |
| |
| if (i40e_container_is_rx(q_vector, rc)) { |
| /* If Rx there are 1 to 4 packets and bytes are less than |
| * 9000 assume insufficient data to use bulk rate limiting |
| * approach unless Tx is already in bulk rate limiting. We |
| * are likely latency driven. |
| */ |
| if (packets && packets < 4 && bytes < 9000 && |
| (q_vector->tx.target_itr & I40E_ITR_ADAPTIVE_LATENCY)) { |
| itr = I40E_ITR_ADAPTIVE_LATENCY; |
| goto adjust_by_size; |
| } |
| } else if (packets < 4) { |
| /* If we have Tx and Rx ITR maxed and Tx ITR is running in |
| * bulk mode and we are receiving 4 or fewer packets just |
| * reset the ITR_ADAPTIVE_LATENCY bit for latency mode so |
| * that the Rx can relax. |
| */ |
| if (rc->target_itr == I40E_ITR_ADAPTIVE_MAX_USECS && |
| (q_vector->rx.target_itr & I40E_ITR_MASK) == |
| I40E_ITR_ADAPTIVE_MAX_USECS) |
| goto clear_counts; |
| } else if (packets > 32) { |
| /* If we have processed over 32 packets in a single interrupt |
| * for Tx assume we need to switch over to "bulk" mode. |
| */ |
| rc->target_itr &= ~I40E_ITR_ADAPTIVE_LATENCY; |
| } |
| |
| /* We have no packets to actually measure against. This means |
| * either one of the other queues on this vector is active or |
| * we are a Tx queue doing TSO with too high of an interrupt rate. |
| * |
| * Between 4 and 56 we can assume that our current interrupt delay |
| * is only slightly too low. As such we should increase it by a small |
| * fixed amount. |
| */ |
| if (packets < 56) { |
| itr = rc->target_itr + I40E_ITR_ADAPTIVE_MIN_INC; |
| if ((itr & I40E_ITR_MASK) > I40E_ITR_ADAPTIVE_MAX_USECS) { |
| itr &= I40E_ITR_ADAPTIVE_LATENCY; |
| itr += I40E_ITR_ADAPTIVE_MAX_USECS; |
| } |
| goto clear_counts; |
| } |
| |
| if (packets <= 256) { |
| itr = min(q_vector->tx.current_itr, q_vector->rx.current_itr); |
| itr &= I40E_ITR_MASK; |
| |
| /* Between 56 and 112 is our "goldilocks" zone where we are |
| * working out "just right". Just report that our current |
| * ITR is good for us. |
| */ |
| if (packets <= 112) |
| goto clear_counts; |
| |
| /* If packet count is 128 or greater we are likely looking |
| * at a slight overrun of the delay we want. Try halving |
| * our delay to see if that will cut the number of packets |
| * in half per interrupt. |
| */ |
| itr /= 2; |
| itr &= I40E_ITR_MASK; |
| if (itr < I40E_ITR_ADAPTIVE_MIN_USECS) |
| itr = I40E_ITR_ADAPTIVE_MIN_USECS; |
| |
| goto clear_counts; |
| } |
| |
| /* The paths below assume we are dealing with a bulk ITR since |
| * number of packets is greater than 256. We are just going to have |
| * to compute a value and try to bring the count under control, |
| * though for smaller packet sizes there isn't much we can do as |
| * NAPI polling will likely be kicking in sooner rather than later. |
| */ |
| itr = I40E_ITR_ADAPTIVE_BULK; |
| |
| adjust_by_size: |
| /* If packet counts are 256 or greater we can assume we have a gross |
| * overestimation of what the rate should be. Instead of trying to fine |
| * tune it just use the formula below to try and dial in an exact value |
| * give the current packet size of the frame. |
| */ |
| avg_wire_size = bytes / packets; |
| |
| /* The following is a crude approximation of: |
| * wmem_default / (size + overhead) = desired_pkts_per_int |
| * rate / bits_per_byte / (size + ethernet overhead) = pkt_rate |
| * (desired_pkt_rate / pkt_rate) * usecs_per_sec = ITR value |
| * |
| * Assuming wmem_default is 212992 and overhead is 640 bytes per |
| * packet, (256 skb, 64 headroom, 320 shared info), we can reduce the |
| * formula down to |
| * |
| * (170 * (size + 24)) / (size + 640) = ITR |
| * |
| * We first do some math on the packet size and then finally bitshift |
| * by 8 after rounding up. We also have to account for PCIe link speed |
| * difference as ITR scales based on this. |
| */ |
| if (avg_wire_size <= 60) { |
| /* Start at 250k ints/sec */ |
| avg_wire_size = 4096; |
| } else if (avg_wire_size <= 380) { |
| /* 250K ints/sec to 60K ints/sec */ |
| avg_wire_size *= 40; |
| avg_wire_size += 1696; |
| } else if (avg_wire_size <= 1084) { |
| /* 60K ints/sec to 36K ints/sec */ |
| avg_wire_size *= 15; |
| avg_wire_size += 11452; |
| } else if (avg_wire_size <= 1980) { |
| /* 36K ints/sec to 30K ints/sec */ |
| avg_wire_size *= 5; |
| avg_wire_size += 22420; |
| } else { |
| /* plateau at a limit of 30K ints/sec */ |
| avg_wire_size = 32256; |
| } |
| |
| /* If we are in low latency mode halve our delay which doubles the |
| * rate to somewhere between 100K to 16K ints/sec |
| */ |
| if (itr & I40E_ITR_ADAPTIVE_LATENCY) |
| avg_wire_size /= 2; |
| |
| /* Resultant value is 256 times larger than it needs to be. This |
| * gives us room to adjust the value as needed to either increase |
| * or decrease the value based on link speeds of 10G, 2.5G, 1G, etc. |
| * |
| * Use addition as we have already recorded the new latency flag |
| * for the ITR value. |
| */ |
| itr += DIV_ROUND_UP(avg_wire_size, i40e_itr_divisor(q_vector)) * |
| I40E_ITR_ADAPTIVE_MIN_INC; |
| |
| if ((itr & I40E_ITR_MASK) > I40E_ITR_ADAPTIVE_MAX_USECS) { |
| itr &= I40E_ITR_ADAPTIVE_LATENCY; |
| itr += I40E_ITR_ADAPTIVE_MAX_USECS; |
| } |
| |
| clear_counts: |
| /* write back value */ |
| rc->target_itr = itr; |
| |
| /* next update should occur within next jiffy */ |
| rc->next_update = next_update + 1; |
| |
| rc->total_bytes = 0; |
| rc->total_packets = 0; |
| } |
| |
| /** |
| * i40e_reuse_rx_page - page flip buffer and store it back on the ring |
| * @rx_ring: rx descriptor ring to store buffers on |
| * @old_buff: donor buffer to have page reused |
| * |
| * Synchronizes page for reuse by the adapter |
| **/ |
| static void i40e_reuse_rx_page(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *old_buff) |
| { |
| struct i40e_rx_buffer *new_buff; |
| u16 nta = rx_ring->next_to_alloc; |
| |
| new_buff = &rx_ring->rx_bi[nta]; |
| |
| /* update, and store next to alloc */ |
| nta++; |
| rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; |
| |
| /* transfer page from old buffer to new buffer */ |
| new_buff->dma = old_buff->dma; |
| new_buff->page = old_buff->page; |
| new_buff->page_offset = old_buff->page_offset; |
| new_buff->pagecnt_bias = old_buff->pagecnt_bias; |
| } |
| |
| /** |
| * i40e_rx_is_programming_status - check for programming status descriptor |
| * @qw: qword representing status_error_len in CPU ordering |
| * |
| * The value of in the descriptor length field indicate if this |
| * is a programming status descriptor for flow director or FCoE |
| * by the value of I40E_RX_PROG_STATUS_DESC_LENGTH, otherwise |
| * it is a packet descriptor. |
| **/ |
| static inline bool i40e_rx_is_programming_status(u64 qw) |
| { |
| /* The Rx filter programming status and SPH bit occupy the same |
| * spot in the descriptor. Since we don't support packet split we |
| * can just reuse the bit as an indication that this is a |
| * programming status descriptor. |
| */ |
| return qw & I40E_RXD_QW1_LENGTH_SPH_MASK; |
| } |
| |
| /** |
| * i40e_clean_programming_status - clean the programming status descriptor |
| * @rx_ring: the rx ring that has this descriptor |
| * @rx_desc: the rx descriptor written back by HW |
| * @qw: qword representing status_error_len in CPU ordering |
| * |
| * Flow director should handle FD_FILTER_STATUS to check its filter programming |
| * status being successful or not and take actions accordingly. FCoE should |
| * handle its context/filter programming/invalidation status and take actions. |
| * |
| **/ |
| static void i40e_clean_programming_status(struct i40e_ring *rx_ring, |
| union i40e_rx_desc *rx_desc, |
| u64 qw) |
| { |
| struct i40e_rx_buffer *rx_buffer; |
| u32 ntc = rx_ring->next_to_clean; |
| u8 id; |
| |
| /* fetch, update, and store next to clean */ |
| rx_buffer = &rx_ring->rx_bi[ntc++]; |
| ntc = (ntc < rx_ring->count) ? ntc : 0; |
| rx_ring->next_to_clean = ntc; |
| |
| prefetch(I40E_RX_DESC(rx_ring, ntc)); |
| |
| /* place unused page back on the ring */ |
| i40e_reuse_rx_page(rx_ring, rx_buffer); |
| rx_ring->rx_stats.page_reuse_count++; |
| |
| /* clear contents of buffer_info */ |
| rx_buffer->page = NULL; |
| |
| id = (qw & I40E_RX_PROG_STATUS_DESC_QW1_PROGID_MASK) >> |
| I40E_RX_PROG_STATUS_DESC_QW1_PROGID_SHIFT; |
| |
| if (id == I40E_RX_PROG_STATUS_DESC_FD_FILTER_STATUS) |
| i40e_fd_handle_status(rx_ring, rx_desc, id); |
| } |
| |
| /** |
| * i40e_setup_tx_descriptors - Allocate the Tx descriptors |
| * @tx_ring: the tx ring to set up |
| * |
| * Return 0 on success, negative on error |
| **/ |
| int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring) |
| { |
| struct device *dev = tx_ring->dev; |
| int bi_size; |
| |
| if (!dev) |
| return -ENOMEM; |
| |
| /* warn if we are about to overwrite the pointer */ |
| WARN_ON(tx_ring->tx_bi); |
| bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; |
| tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL); |
| if (!tx_ring->tx_bi) |
| goto err; |
| |
| u64_stats_init(&tx_ring->syncp); |
| |
| /* round up to nearest 4K */ |
| tx_ring->size = tx_ring->count * sizeof(struct i40e_tx_desc); |
| /* add u32 for head writeback, align after this takes care of |
| * guaranteeing this is at least one cache line in size |
| */ |
| tx_ring->size += sizeof(u32); |
| tx_ring->size = ALIGN(tx_ring->size, 4096); |
| tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size, |
| &tx_ring->dma, GFP_KERNEL); |
| if (!tx_ring->desc) { |
| dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n", |
| tx_ring->size); |
| goto err; |
| } |
| |
| tx_ring->next_to_use = 0; |
| tx_ring->next_to_clean = 0; |
| tx_ring->tx_stats.prev_pkt_ctr = -1; |
| return 0; |
| |
| err: |
| kfree(tx_ring->tx_bi); |
| tx_ring->tx_bi = NULL; |
| return -ENOMEM; |
| } |
| |
| /** |
| * i40e_clean_rx_ring - Free Rx buffers |
| * @rx_ring: ring to be cleaned |
| **/ |
| void i40e_clean_rx_ring(struct i40e_ring *rx_ring) |
| { |
| unsigned long bi_size; |
| u16 i; |
| |
| /* ring already cleared, nothing to do */ |
| if (!rx_ring->rx_bi) |
| return; |
| |
| if (rx_ring->skb) { |
| dev_kfree_skb(rx_ring->skb); |
| rx_ring->skb = NULL; |
| } |
| |
| /* Free all the Rx ring sk_buffs */ |
| for (i = 0; i < rx_ring->count; i++) { |
| struct i40e_rx_buffer *rx_bi = &rx_ring->rx_bi[i]; |
| |
| if (!rx_bi->page) |
| continue; |
| |
| /* Invalidate cache lines that may have been written to by |
| * device so that we avoid corrupting memory. |
| */ |
| dma_sync_single_range_for_cpu(rx_ring->dev, |
| rx_bi->dma, |
| rx_bi->page_offset, |
| rx_ring->rx_buf_len, |
| DMA_FROM_DEVICE); |
| |
| /* free resources associated with mapping */ |
| dma_unmap_page_attrs(rx_ring->dev, rx_bi->dma, |
| i40e_rx_pg_size(rx_ring), |
| DMA_FROM_DEVICE, |
| I40E_RX_DMA_ATTR); |
| |
| __page_frag_cache_drain(rx_bi->page, rx_bi->pagecnt_bias); |
| |
| rx_bi->page = NULL; |
| rx_bi->page_offset = 0; |
| } |
| |
| bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; |
| memset(rx_ring->rx_bi, 0, bi_size); |
| |
| /* Zero out the descriptor ring */ |
| memset(rx_ring->desc, 0, rx_ring->size); |
| |
| rx_ring->next_to_alloc = 0; |
| rx_ring->next_to_clean = 0; |
| rx_ring->next_to_use = 0; |
| } |
| |
| /** |
| * i40e_free_rx_resources - Free Rx resources |
| * @rx_ring: ring to clean the resources from |
| * |
| * Free all receive software resources |
| **/ |
| void i40e_free_rx_resources(struct i40e_ring *rx_ring) |
| { |
| i40e_clean_rx_ring(rx_ring); |
| if (rx_ring->vsi->type == I40E_VSI_MAIN) |
| xdp_rxq_info_unreg(&rx_ring->xdp_rxq); |
| rx_ring->xdp_prog = NULL; |
| kfree(rx_ring->rx_bi); |
| rx_ring->rx_bi = NULL; |
| |
| if (rx_ring->desc) { |
| dma_free_coherent(rx_ring->dev, rx_ring->size, |
| rx_ring->desc, rx_ring->dma); |
| rx_ring->desc = NULL; |
| } |
| } |
| |
| /** |
| * i40e_setup_rx_descriptors - Allocate Rx descriptors |
| * @rx_ring: Rx descriptor ring (for a specific queue) to setup |
| * |
| * Returns 0 on success, negative on failure |
| **/ |
| int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring) |
| { |
| struct device *dev = rx_ring->dev; |
| int err = -ENOMEM; |
| int bi_size; |
| |
| /* warn if we are about to overwrite the pointer */ |
| WARN_ON(rx_ring->rx_bi); |
| bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; |
| rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL); |
| if (!rx_ring->rx_bi) |
| goto err; |
| |
| u64_stats_init(&rx_ring->syncp); |
| |
| /* Round up to nearest 4K */ |
| rx_ring->size = rx_ring->count * sizeof(union i40e_32byte_rx_desc); |
| rx_ring->size = ALIGN(rx_ring->size, 4096); |
| rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size, |
| &rx_ring->dma, GFP_KERNEL); |
| |
| if (!rx_ring->desc) { |
| dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n", |
| rx_ring->size); |
| goto err; |
| } |
| |
| rx_ring->next_to_alloc = 0; |
| rx_ring->next_to_clean = 0; |
| rx_ring->next_to_use = 0; |
| |
| /* XDP RX-queue info only needed for RX rings exposed to XDP */ |
| if (rx_ring->vsi->type == I40E_VSI_MAIN) { |
| err = xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev, |
| rx_ring->queue_index); |
| if (err < 0) |
| goto err; |
| } |
| |
| rx_ring->xdp_prog = rx_ring->vsi->xdp_prog; |
| |
| return 0; |
| err: |
| kfree(rx_ring->rx_bi); |
| rx_ring->rx_bi = NULL; |
| return err; |
| } |
| |
| /** |
| * i40e_release_rx_desc - Store the new tail and head values |
| * @rx_ring: ring to bump |
| * @val: new head index |
| **/ |
| static inline void i40e_release_rx_desc(struct i40e_ring *rx_ring, u32 val) |
| { |
| rx_ring->next_to_use = val; |
| |
| /* update next to alloc since we have filled the ring */ |
| rx_ring->next_to_alloc = val; |
| |
| /* Force memory writes to complete before letting h/w |
| * know there are new descriptors to fetch. (Only |
| * applicable for weak-ordered memory model archs, |
| * such as IA-64). |
| */ |
| wmb(); |
| writel(val, rx_ring->tail); |
| } |
| |
| /** |
| * i40e_rx_offset - Return expected offset into page to access data |
| * @rx_ring: Ring we are requesting offset of |
| * |
| * Returns the offset value for ring into the data buffer. |
| */ |
| static inline unsigned int i40e_rx_offset(struct i40e_ring *rx_ring) |
| { |
| return ring_uses_build_skb(rx_ring) ? I40E_SKB_PAD : 0; |
| } |
| |
| /** |
| * i40e_alloc_mapped_page - recycle or make a new page |
| * @rx_ring: ring to use |
| * @bi: rx_buffer struct to modify |
| * |
| * Returns true if the page was successfully allocated or |
| * reused. |
| **/ |
| static bool i40e_alloc_mapped_page(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *bi) |
| { |
| struct page *page = bi->page; |
| dma_addr_t dma; |
| |
| /* since we are recycling buffers we should seldom need to alloc */ |
| if (likely(page)) { |
| rx_ring->rx_stats.page_reuse_count++; |
| return true; |
| } |
| |
| /* alloc new page for storage */ |
| page = dev_alloc_pages(i40e_rx_pg_order(rx_ring)); |
| if (unlikely(!page)) { |
| rx_ring->rx_stats.alloc_page_failed++; |
| return false; |
| } |
| |
| /* map page for use */ |
| dma = dma_map_page_attrs(rx_ring->dev, page, 0, |
| i40e_rx_pg_size(rx_ring), |
| DMA_FROM_DEVICE, |
| I40E_RX_DMA_ATTR); |
| |
| /* if mapping failed free memory back to system since |
| * there isn't much point in holding memory we can't use |
| */ |
| if (dma_mapping_error(rx_ring->dev, dma)) { |
| __free_pages(page, i40e_rx_pg_order(rx_ring)); |
| rx_ring->rx_stats.alloc_page_failed++; |
| return false; |
| } |
| |
| bi->dma = dma; |
| bi->page = page; |
| bi->page_offset = i40e_rx_offset(rx_ring); |
| page_ref_add(page, USHRT_MAX - 1); |
| bi->pagecnt_bias = USHRT_MAX; |
| |
| return true; |
| } |
| |
| /** |
| * i40e_receive_skb - Send a completed packet up the stack |
| * @rx_ring: rx ring in play |
| * @skb: packet to send up |
| * @vlan_tag: vlan tag for packet |
| **/ |
| static void i40e_receive_skb(struct i40e_ring *rx_ring, |
| struct sk_buff *skb, u16 vlan_tag) |
| { |
| struct i40e_q_vector *q_vector = rx_ring->q_vector; |
| |
| if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && |
| (vlan_tag & VLAN_VID_MASK)) |
| __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); |
| |
| napi_gro_receive(&q_vector->napi, skb); |
| } |
| |
| /** |
| * i40e_alloc_rx_buffers - Replace used receive buffers |
| * @rx_ring: ring to place buffers on |
| * @cleaned_count: number of buffers to replace |
| * |
| * Returns false if all allocations were successful, true if any fail |
| **/ |
| bool i40e_alloc_rx_buffers(struct i40e_ring *rx_ring, u16 cleaned_count) |
| { |
| u16 ntu = rx_ring->next_to_use; |
| union i40e_rx_desc *rx_desc; |
| struct i40e_rx_buffer *bi; |
| |
| /* do nothing if no valid netdev defined */ |
| if (!rx_ring->netdev || !cleaned_count) |
| return false; |
| |
| rx_desc = I40E_RX_DESC(rx_ring, ntu); |
| bi = &rx_ring->rx_bi[ntu]; |
| |
| do { |
| if (!i40e_alloc_mapped_page(rx_ring, bi)) |
| goto no_buffers; |
| |
| /* sync the buffer for use by the device */ |
| dma_sync_single_range_for_device(rx_ring->dev, bi->dma, |
| bi->page_offset, |
| rx_ring->rx_buf_len, |
| DMA_FROM_DEVICE); |
| |
| /* Refresh the desc even if buffer_addrs didn't change |
| * because each write-back erases this info. |
| */ |
| rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset); |
| |
| rx_desc++; |
| bi++; |
| ntu++; |
| if (unlikely(ntu == rx_ring->count)) { |
| rx_desc = I40E_RX_DESC(rx_ring, 0); |
| bi = rx_ring->rx_bi; |
| ntu = 0; |
| } |
| |
| /* clear the status bits for the next_to_use descriptor */ |
| rx_desc->wb.qword1.status_error_len = 0; |
| |
| cleaned_count--; |
| } while (cleaned_count); |
| |
| if (rx_ring->next_to_use != ntu) |
| i40e_release_rx_desc(rx_ring, ntu); |
| |
| return false; |
| |
| no_buffers: |
| if (rx_ring->next_to_use != ntu) |
| i40e_release_rx_desc(rx_ring, ntu); |
| |
| /* make sure to come back via polling to try again after |
| * allocation failure |
| */ |
| return true; |
| } |
| |
| /** |
| * i40e_rx_checksum - Indicate in skb if hw indicated a good cksum |
| * @vsi: the VSI we care about |
| * @skb: skb currently being received and modified |
| * @rx_desc: the receive descriptor |
| **/ |
| static inline void i40e_rx_checksum(struct i40e_vsi *vsi, |
| struct sk_buff *skb, |
| union i40e_rx_desc *rx_desc) |
| { |
| struct i40e_rx_ptype_decoded decoded; |
| u32 rx_error, rx_status; |
| bool ipv4, ipv6; |
| u8 ptype; |
| u64 qword; |
| |
| qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT; |
| rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >> |
| I40E_RXD_QW1_ERROR_SHIFT; |
| rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> |
| I40E_RXD_QW1_STATUS_SHIFT; |
| decoded = decode_rx_desc_ptype(ptype); |
| |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| skb_checksum_none_assert(skb); |
| |
| /* Rx csum enabled and ip headers found? */ |
| if (!(vsi->netdev->features & NETIF_F_RXCSUM)) |
| return; |
| |
| /* did the hardware decode the packet and checksum? */ |
| if (!(rx_status & BIT(I40E_RX_DESC_STATUS_L3L4P_SHIFT))) |
| return; |
| |
| /* both known and outer_ip must be set for the below code to work */ |
| if (!(decoded.known && decoded.outer_ip)) |
| return; |
| |
| ipv4 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && |
| (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4); |
| ipv6 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && |
| (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6); |
| |
| if (ipv4 && |
| (rx_error & (BIT(I40E_RX_DESC_ERROR_IPE_SHIFT) | |
| BIT(I40E_RX_DESC_ERROR_EIPE_SHIFT)))) |
| goto checksum_fail; |
| |
| /* likely incorrect csum if alternate IP extension headers found */ |
| if (ipv6 && |
| rx_status & BIT(I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT)) |
| /* don't increment checksum err here, non-fatal err */ |
| return; |
| |
| /* there was some L4 error, count error and punt packet to the stack */ |
| if (rx_error & BIT(I40E_RX_DESC_ERROR_L4E_SHIFT)) |
| goto checksum_fail; |
| |
| /* handle packets that were not able to be checksummed due |
| * to arrival speed, in this case the stack can compute |
| * the csum. |
| */ |
| if (rx_error & BIT(I40E_RX_DESC_ERROR_PPRS_SHIFT)) |
| return; |
| |
| /* If there is an outer header present that might contain a checksum |
| * we need to bump the checksum level by 1 to reflect the fact that |
| * we are indicating we validated the inner checksum. |
| */ |
| if (decoded.tunnel_type >= I40E_RX_PTYPE_TUNNEL_IP_GRENAT) |
| skb->csum_level = 1; |
| |
| /* Only report checksum unnecessary for TCP, UDP, or SCTP */ |
| switch (decoded.inner_prot) { |
| case I40E_RX_PTYPE_INNER_PROT_TCP: |
| case I40E_RX_PTYPE_INNER_PROT_UDP: |
| case I40E_RX_PTYPE_INNER_PROT_SCTP: |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| /* fall though */ |
| default: |
| break; |
| } |
| |
| return; |
| |
| checksum_fail: |
| vsi->back->hw_csum_rx_error++; |
| } |
| |
| /** |
| * i40e_ptype_to_htype - get a hash type |
| * @ptype: the ptype value from the descriptor |
| * |
| * Returns a hash type to be used by skb_set_hash |
| **/ |
| static inline int i40e_ptype_to_htype(u8 ptype) |
| { |
| struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype); |
| |
| if (!decoded.known) |
| return PKT_HASH_TYPE_NONE; |
| |
| if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && |
| decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY4) |
| return PKT_HASH_TYPE_L4; |
| else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && |
| decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY3) |
| return PKT_HASH_TYPE_L3; |
| else |
| return PKT_HASH_TYPE_L2; |
| } |
| |
| /** |
| * i40e_rx_hash - set the hash value in the skb |
| * @ring: descriptor ring |
| * @rx_desc: specific descriptor |
| * @skb: skb currently being received and modified |
| * @rx_ptype: Rx packet type |
| **/ |
| static inline void i40e_rx_hash(struct i40e_ring *ring, |
| union i40e_rx_desc *rx_desc, |
| struct sk_buff *skb, |
| u8 rx_ptype) |
| { |
| u32 hash; |
| const __le64 rss_mask = |
| cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH << |
| I40E_RX_DESC_STATUS_FLTSTAT_SHIFT); |
| |
| if (!(ring->netdev->features & NETIF_F_RXHASH)) |
| return; |
| |
| if ((rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) { |
| hash = le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss); |
| skb_set_hash(skb, hash, i40e_ptype_to_htype(rx_ptype)); |
| } |
| } |
| |
| /** |
| * i40e_process_skb_fields - Populate skb header fields from Rx descriptor |
| * @rx_ring: rx descriptor ring packet is being transacted on |
| * @rx_desc: pointer to the EOP Rx descriptor |
| * @skb: pointer to current skb being populated |
| * @rx_ptype: the packet type decoded by hardware |
| * |
| * This function checks the ring, descriptor, and packet information in |
| * order to populate the hash, checksum, VLAN, protocol, and |
| * other fields within the skb. |
| **/ |
| static inline |
| void i40e_process_skb_fields(struct i40e_ring *rx_ring, |
| union i40e_rx_desc *rx_desc, struct sk_buff *skb, |
| u8 rx_ptype) |
| { |
| u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| u32 rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> |
| I40E_RXD_QW1_STATUS_SHIFT; |
| u32 tsynvalid = rx_status & I40E_RXD_QW1_STATUS_TSYNVALID_MASK; |
| u32 tsyn = (rx_status & I40E_RXD_QW1_STATUS_TSYNINDX_MASK) >> |
| I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT; |
| |
| if (unlikely(tsynvalid)) |
| i40e_ptp_rx_hwtstamp(rx_ring->vsi->back, skb, tsyn); |
| |
| i40e_rx_hash(rx_ring, rx_desc, skb, rx_ptype); |
| |
| i40e_rx_checksum(rx_ring->vsi, skb, rx_desc); |
| |
| skb_record_rx_queue(skb, rx_ring->queue_index); |
| |
| /* modifies the skb - consumes the enet header */ |
| skb->protocol = eth_type_trans(skb, rx_ring->netdev); |
| } |
| |
| /** |
| * i40e_cleanup_headers - Correct empty headers |
| * @rx_ring: rx descriptor ring packet is being transacted on |
| * @skb: pointer to current skb being fixed |
| * @rx_desc: pointer to the EOP Rx descriptor |
| * |
| * Also address the case where we are pulling data in on pages only |
| * and as such no data is present in the skb header. |
| * |
| * In addition if skb is not at least 60 bytes we need to pad it so that |
| * it is large enough to qualify as a valid Ethernet frame. |
| * |
| * Returns true if an error was encountered and skb was freed. |
| **/ |
| static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb, |
| union i40e_rx_desc *rx_desc) |
| |
| { |
| /* XDP packets use error pointer so abort at this point */ |
| if (IS_ERR(skb)) |
| return true; |
| |
| /* ERR_MASK will only have valid bits if EOP set, and |
| * what we are doing here is actually checking |
| * I40E_RX_DESC_ERROR_RXE_SHIFT, since it is the zeroth bit in |
| * the error field |
| */ |
| if (unlikely(i40e_test_staterr(rx_desc, |
| BIT(I40E_RXD_QW1_ERROR_SHIFT)))) { |
| dev_kfree_skb_any(skb); |
| return true; |
| } |
| |
| /* if eth_skb_pad returns an error the skb was freed */ |
| if (eth_skb_pad(skb)) |
| return true; |
| |
| return false; |
| } |
| |
| /** |
| * i40e_page_is_reusable - check if any reuse is possible |
| * @page: page struct to check |
| * |
| * A page is not reusable if it was allocated under low memory |
| * conditions, or it's not in the same NUMA node as this CPU. |
| */ |
| static inline bool i40e_page_is_reusable(struct page *page) |
| { |
| return (page_to_nid(page) == numa_mem_id()) && |
| !page_is_pfmemalloc(page); |
| } |
| |
| /** |
| * i40e_can_reuse_rx_page - Determine if this page can be reused by |
| * the adapter for another receive |
| * |
| * @rx_buffer: buffer containing the page |
| * |
| * If page is reusable, rx_buffer->page_offset is adjusted to point to |
| * an unused region in the page. |
| * |
| * For small pages, @truesize will be a constant value, half the size |
| * of the memory at page. We'll attempt to alternate between high and |
| * low halves of the page, with one half ready for use by the hardware |
| * and the other half being consumed by the stack. We use the page |
| * ref count to determine whether the stack has finished consuming the |
| * portion of this page that was passed up with a previous packet. If |
| * the page ref count is >1, we'll assume the "other" half page is |
| * still busy, and this page cannot be reused. |
| * |
| * For larger pages, @truesize will be the actual space used by the |
| * received packet (adjusted upward to an even multiple of the cache |
| * line size). This will advance through the page by the amount |
| * actually consumed by the received packets while there is still |
| * space for a buffer. Each region of larger pages will be used at |
| * most once, after which the page will not be reused. |
| * |
| * In either case, if the page is reusable its refcount is increased. |
| **/ |
| static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer) |
| { |
| unsigned int pagecnt_bias = rx_buffer->pagecnt_bias; |
| struct page *page = rx_buffer->page; |
| |
| /* Is any reuse possible? */ |
| if (unlikely(!i40e_page_is_reusable(page))) |
| return false; |
| |
| #if (PAGE_SIZE < 8192) |
| /* if we are only owner of page we can reuse it */ |
| if (unlikely((page_count(page) - pagecnt_bias) > 1)) |
| return false; |
| #else |
| #define I40E_LAST_OFFSET \ |
| (SKB_WITH_OVERHEAD(PAGE_SIZE) - I40E_RXBUFFER_2048) |
| if (rx_buffer->page_offset > I40E_LAST_OFFSET) |
| return false; |
| #endif |
| |
| /* If we have drained the page fragment pool we need to update |
| * the pagecnt_bias and page count so that we fully restock the |
| * number of references the driver holds. |
| */ |
| if (unlikely(pagecnt_bias == 1)) { |
| page_ref_add(page, USHRT_MAX - 1); |
| rx_buffer->pagecnt_bias = USHRT_MAX; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff |
| * @rx_ring: rx descriptor ring to transact packets on |
| * @rx_buffer: buffer containing page to add |
| * @skb: sk_buff to place the data into |
| * @size: packet length from rx_desc |
| * |
| * This function will add the data contained in rx_buffer->page to the skb. |
| * It will just attach the page as a frag to the skb. |
| * |
| * The function will then update the page offset. |
| **/ |
| static void i40e_add_rx_frag(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *rx_buffer, |
| struct sk_buff *skb, |
| unsigned int size) |
| { |
| #if (PAGE_SIZE < 8192) |
| unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
| #else |
| unsigned int truesize = SKB_DATA_ALIGN(size + i40e_rx_offset(rx_ring)); |
| #endif |
| |
| skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page, |
| rx_buffer->page_offset, size, truesize); |
| |
| /* page is being used so we must update the page offset */ |
| #if (PAGE_SIZE < 8192) |
| rx_buffer->page_offset ^= truesize; |
| #else |
| rx_buffer->page_offset += truesize; |
| #endif |
| } |
| |
| /** |
| * i40e_get_rx_buffer - Fetch Rx buffer and synchronize data for use |
| * @rx_ring: rx descriptor ring to transact packets on |
| * @size: size of buffer to add to skb |
| * |
| * This function will pull an Rx buffer from the ring and synchronize it |
| * for use by the CPU. |
| */ |
| static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring, |
| const unsigned int size) |
| { |
| struct i40e_rx_buffer *rx_buffer; |
| |
| rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean]; |
| prefetchw(rx_buffer->page); |
| |
| /* we are reusing so sync this buffer for CPU use */ |
| dma_sync_single_range_for_cpu(rx_ring->dev, |
| rx_buffer->dma, |
| rx_buffer->page_offset, |
| size, |
| DMA_FROM_DEVICE); |
| |
| /* We have pulled a buffer for use, so decrement pagecnt_bias */ |
| rx_buffer->pagecnt_bias--; |
| |
| return rx_buffer; |
| } |
| |
| /** |
| * i40e_construct_skb - Allocate skb and populate it |
| * @rx_ring: rx descriptor ring to transact packets on |
| * @rx_buffer: rx buffer to pull data from |
| * @xdp: xdp_buff pointing to the data |
| * |
| * This function allocates an skb. It then populates it with the page |
| * data from the current receive descriptor, taking care to set up the |
| * skb correctly. |
| */ |
| static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *rx_buffer, |
| struct xdp_buff *xdp) |
| { |
| unsigned int size = xdp->data_end - xdp->data; |
| #if (PAGE_SIZE < 8192) |
| unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
| #else |
| unsigned int truesize = SKB_DATA_ALIGN(size); |
| #endif |
| unsigned int headlen; |
| struct sk_buff *skb; |
| |
| /* prefetch first cache line of first page */ |
| prefetch(xdp->data); |
| #if L1_CACHE_BYTES < 128 |
| prefetch(xdp->data + L1_CACHE_BYTES); |
| #endif |
| /* Note, we get here by enabling legacy-rx via: |
| * |
| * ethtool --set-priv-flags <dev> legacy-rx on |
| * |
| * In this mode, we currently get 0 extra XDP headroom as |
| * opposed to having legacy-rx off, where we process XDP |
| * packets going to stack via i40e_build_skb(). The latter |
| * provides us currently with 192 bytes of headroom. |
| * |
| * For i40e_construct_skb() mode it means that the |
| * xdp->data_meta will always point to xdp->data, since |
| * the helper cannot expand the head. Should this ever |
| * change in future for legacy-rx mode on, then lets also |
| * add xdp->data_meta handling here. |
| */ |
| |
| /* allocate a skb to store the frags */ |
| skb = __napi_alloc_skb(&rx_ring->q_vector->napi, |
| I40E_RX_HDR_SIZE, |
| GFP_ATOMIC | __GFP_NOWARN); |
| if (unlikely(!skb)) |
| return NULL; |
| |
| /* Determine available headroom for copy */ |
| headlen = size; |
| if (headlen > I40E_RX_HDR_SIZE) |
| headlen = eth_get_headlen(xdp->data, I40E_RX_HDR_SIZE); |
| |
| /* align pull length to size of long to optimize memcpy performance */ |
| memcpy(__skb_put(skb, headlen), xdp->data, |
| ALIGN(headlen, sizeof(long))); |
| |
| /* update all of the pointers */ |
| size -= headlen; |
| if (size) { |
| skb_add_rx_frag(skb, 0, rx_buffer->page, |
| rx_buffer->page_offset + headlen, |
| size, truesize); |
| |
| /* buffer is used by skb, update page_offset */ |
| #if (PAGE_SIZE < 8192) |
| rx_buffer->page_offset ^= truesize; |
| #else |
| rx_buffer->page_offset += truesize; |
| #endif |
| } else { |
| /* buffer is unused, reset bias back to rx_buffer */ |
| rx_buffer->pagecnt_bias++; |
| } |
| |
| return skb; |
| } |
| |
| /** |
| * i40e_build_skb - Build skb around an existing buffer |
| * @rx_ring: Rx descriptor ring to transact packets on |
| * @rx_buffer: Rx buffer to pull data from |
| * @xdp: xdp_buff pointing to the data |
| * |
| * This function builds an skb around an existing Rx buffer, taking care |
| * to set up the skb correctly and avoid any memcpy overhead. |
| */ |
| static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *rx_buffer, |
| struct xdp_buff *xdp) |
| { |
| unsigned int metasize = xdp->data - xdp->data_meta; |
| #if (PAGE_SIZE < 8192) |
| unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
| #else |
| unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + |
| SKB_DATA_ALIGN(I40E_SKB_PAD + |
| (xdp->data_end - |
| xdp->data_hard_start)); |
| #endif |
| struct sk_buff *skb; |
| |
| /* Prefetch first cache line of first page. If xdp->data_meta |
| * is unused, this points exactly as xdp->data, otherwise we |
| * likely have a consumer accessing first few bytes of meta |
| * data, and then actual data. |
| */ |
| prefetch(xdp->data_meta); |
| #if L1_CACHE_BYTES < 128 |
| prefetch(xdp->data_meta + L1_CACHE_BYTES); |
| #endif |
| /* build an skb around the page buffer */ |
| skb = build_skb(xdp->data_hard_start, truesize); |
| if (unlikely(!skb)) |
| return NULL; |
| |
| /* update pointers within the skb to store the data */ |
| skb_reserve(skb, I40E_SKB_PAD + (xdp->data - xdp->data_hard_start)); |
| __skb_put(skb, xdp->data_end - xdp->data); |
| if (metasize) |
| skb_metadata_set(skb, metasize); |
| |
| /* buffer is used by skb, update page_offset */ |
| #if (PAGE_SIZE < 8192) |
| rx_buffer->page_offset ^= truesize; |
| #else |
| rx_buffer->page_offset += truesize; |
| #endif |
| |
| return skb; |
| } |
| |
| /** |
| * i40e_put_rx_buffer - Clean up used buffer and either recycle or free |
| * @rx_ring: rx descriptor ring to transact packets on |
| * @rx_buffer: rx buffer to pull data from |
| * |
| * This function will clean up the contents of the rx_buffer. It will |
| * either recycle the buffer or unmap it and free the associated resources. |
| */ |
| static void i40e_put_rx_buffer(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *rx_buffer) |
| { |
| if (i40e_can_reuse_rx_page(rx_buffer)) { |
| /* hand second half of page back to the ring */ |
| i40e_reuse_rx_page(rx_ring, rx_buffer); |
| rx_ring->rx_stats.page_reuse_count++; |
| } else { |
| /* we are not reusing the buffer so unmap it */ |
| dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma, |
| i40e_rx_pg_size(rx_ring), |
| DMA_FROM_DEVICE, I40E_RX_DMA_ATTR); |
| __page_frag_cache_drain(rx_buffer->page, |
| rx_buffer->pagecnt_bias); |
| } |
| |
| /* clear contents of buffer_info */ |
| rx_buffer->page = NULL; |
| } |
| |
| /** |
| * i40e_is_non_eop - process handling of non-EOP buffers |
| * @rx_ring: Rx ring being processed |
| * @rx_desc: Rx descriptor for current buffer |
| * @skb: Current socket buffer containing buffer in progress |
| * |
| * This function updates next to clean. If the buffer is an EOP buffer |
| * this function exits returning false, otherwise it will place the |
| * sk_buff in the next buffer to be chained and return true indicating |
| * that this is in fact a non-EOP buffer. |
| **/ |
| static bool i40e_is_non_eop(struct i40e_ring *rx_ring, |
| union i40e_rx_desc *rx_desc, |
| struct sk_buff *skb) |
| { |
| u32 ntc = rx_ring->next_to_clean + 1; |
| |
| /* fetch, update, and store next to clean */ |
| ntc = (ntc < rx_ring->count) ? ntc : 0; |
| rx_ring->next_to_clean = ntc; |
| |
| prefetch(I40E_RX_DESC(rx_ring, ntc)); |
| |
| /* if we are the last buffer then there is nothing else to do */ |
| #define I40E_RXD_EOF BIT(I40E_RX_DESC_STATUS_EOF_SHIFT) |
| if (likely(i40e_test_staterr(rx_desc, I40E_RXD_EOF))) |
| return false; |
| |
| rx_ring->rx_stats.non_eop_descs++; |
| |
| return true; |
| } |
| |
| #define I40E_XDP_PASS 0 |
| #define I40E_XDP_CONSUMED 1 |
| #define I40E_XDP_TX 2 |
| |
| static int i40e_xmit_xdp_ring(struct xdp_frame *xdpf, |
| struct i40e_ring *xdp_ring); |
| |
| static int i40e_xmit_xdp_tx_ring(struct xdp_buff *xdp, |
| struct i40e_ring *xdp_ring) |
| { |
| struct xdp_frame *xdpf = convert_to_xdp_frame(xdp); |
| |
| if (unlikely(!xdpf)) |
| return I40E_XDP_CONSUMED; |
| |
| return i40e_xmit_xdp_ring(xdpf, xdp_ring); |
| } |
| |
| /** |
| * i40e_run_xdp - run an XDP program |
| * @rx_ring: Rx ring being processed |
| * @xdp: XDP buffer containing the frame |
| **/ |
| static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring, |
| struct xdp_buff *xdp) |
| { |
| int err, result = I40E_XDP_PASS; |
| struct i40e_ring *xdp_ring; |
| struct bpf_prog *xdp_prog; |
| u32 act; |
| |
| rcu_read_lock(); |
| xdp_prog = READ_ONCE(rx_ring->xdp_prog); |
| |
| if (!xdp_prog) |
| goto xdp_out; |
| |
| prefetchw(xdp->data_hard_start); /* xdp_frame write */ |
| |
| act = bpf_prog_run_xdp(xdp_prog, xdp); |
| switch (act) { |
| case XDP_PASS: |
| break; |
| case XDP_TX: |
| xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; |
| result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring); |
| break; |
| case XDP_REDIRECT: |
| err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); |
| result = !err ? I40E_XDP_TX : I40E_XDP_CONSUMED; |
| break; |
| default: |
| bpf_warn_invalid_xdp_action(act); |
| case XDP_ABORTED: |
| trace_xdp_exception(rx_ring->netdev, xdp_prog, act); |
| /* fallthrough -- handle aborts by dropping packet */ |
| case XDP_DROP: |
| result = I40E_XDP_CONSUMED; |
| break; |
| } |
| xdp_out: |
| rcu_read_unlock(); |
| return ERR_PTR(-result); |
| } |
| |
| /** |
| * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region |
| * @rx_ring: Rx ring |
| * @rx_buffer: Rx buffer to adjust |
| * @size: Size of adjustment |
| **/ |
| static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring, |
| struct i40e_rx_buffer *rx_buffer, |
| unsigned int size) |
| { |
| #if (PAGE_SIZE < 8192) |
| unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
| |
| rx_buffer->page_offset ^= truesize; |
| #else |
| unsigned int truesize = SKB_DATA_ALIGN(i40e_rx_offset(rx_ring) + size); |
| |
| rx_buffer->page_offset += truesize; |
| #endif |
| } |
| |
| static inline void i40e_xdp_ring_update_tail(struct i40e_ring *xdp_ring) |
| { |
| /* Force memory writes to complete before letting h/w |
| * know there are new descriptors to fetch. |
| */ |
| wmb(); |
| writel_relaxed(xdp_ring->next_to_use, xdp_ring->tail); |
| }; |
| |
| const size_t len_ethhdr = sizeof(struct ethhdr); |
| const size_t len_ipv4hdr = sizeof(struct iphdr); |
| const size_t len_ipv6hdr = sizeof(struct ipv6hdr); |
| |
| enum XDP_META_PTYPE |
| { |
| XDP_META_PTYPE_VALID, |
| XDP_META_PTYPE_IPV6, |
| XDP_META_PTYPE_TCP, |
| XDP_META_PTYPE_UDP, |
| XDP_META_PTYPE_ICMP, |
| XDP_META_PTYPE_END |
| }; |
| |
| /* #define PARSE_HEADERS */ |
| struct xdp_hw_hints |
| { |
| DECLARE_BITMAP(ptype,XDP_META_PTYPE_END); |
| u32 hash; |
| u8 l3hdroffset; |
| u8 l4hdroffset; |
| u8 proto; |
| bool fragmented; |
| #ifdef PARSE_HEADERS |
| union { |
| __be32 addr4; |
| __be32 addr6[4]; |
| }srcip; |
| union { |
| __be32 addr4; |
| __be32 addr6[4]; |
| }dstip; |
| __u16 srcport; |
| __u16 dstport; |
| #endif |
| }; |
| |
| /** |
| * i40e_process_hints - Retrieve the packet info from hw and package it |
| **/ |
| static void i40e_process_hints(union i40e_rx_desc *rxdesc, |
| struct xdp_buff *xdp) |
| { |
| |
| struct i40e_rx_ptype_decoded ptype={0}; |
| u16 fltstatus = 0; |
| unsigned long long start, end; |
| struct xdp_hw_hints hints = {0}; |
| start = rdtsc(); |
| |
| do { |
| u64 stserr = rxdesc->wb.qword1.status_error_len; |
| u64 sts = stserr & 0xFFFF; |
| struct iphdr *ip4h; |
| struct ipv6hdr *ip6h; |
| struct tcphdr *tcph; |
| struct udphdr *udph; |
| |
| // Check if the packet is complete |
| if (!(sts & BIT(I40E_RX_DESC_STATUS_DD_SHIFT))) |
| break; |
| |
| ptype = i40e_ptype_lookup[(stserr & I40E_RXD_QW1_PTYPE_MASK) >> |
| I40E_RXD_QW1_PTYPE_SHIFT]; |
| if (!ptype.known) |
| break; |
| |
| hints.l3hdroffset = len_ethhdr; |
| /* |
| * Adjustment for vlan tag - Not needed for loadbalancers |
| * |
| * if (rxdesc->wb.qword1.status_error_len & |
| * (0x1ULL << (I40E_RX_DESC_STATUS_L2TAG1P_SHIFT + I40E_RXD_QW1_STATUS_SHIFT))) |
| * hints.l3hdroffset += 4; |
| */ |
| |
| set_bit(XDP_META_PTYPE_VALID, hints.ptype); |
| if(ptype.outer_ip == I40E_RX_PTYPE_OUTER_IP) { |
| if (ptype.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4) { |
| /* IPv4 packet */ |
| clear_bit(XDP_META_PTYPE_IPV6, hints.ptype); |
| ip4h = xdp->data + hints.l3hdroffset; |
| hints.proto = ip4h->protocol; |
| #ifdef PARSE_HEADERS |
| hints.srcip.addr4 = ip4h->saddr; |
| hints.dstip.addr4 = ip4h->daddr; |
| #endif |
| hints.l4hdroffset = len_ethhdr + ip4h->ihl * 4; |
| |
| } |
| else if (ptype.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6){ |
| /* IPv6 packet */ |
| set_bit(XDP_META_PTYPE_IPV6, hints.ptype); |
| ip6h = xdp->data + hints.l3hdroffset; |
| hints.proto = ip6h->nexthdr; |
| #ifdef PARSE_HEADERS |
| memcpy(hints.srcip.addr6, |
| ip6h->saddr.s6_addr32,16); |
| memcpy(hints.dstip.addr6, |
| ip6h->daddr.s6_addr32, 16); |
| #endif |
| /* Todo: Adjust for IP Options */ |
| hints.l4hdroffset = len_ethhdr + len_ipv6hdr; |
| } |
| } |
| |
| hints.fragmented = ptype.outer_frag; |
| trace_printk("ptype=%d IPV6= %d inner_proto= %d hash %x fragmented:%d l3hdroffset:%d" |
| " l4hdroffset:%d",ptype.ptype, ptype.outer_ip_ver, |
| ptype.inner_prot, hints.hash, hints.fragmented, |
| hints.l3hdroffset,hints.l4hdroffset); |
| |
| if (hints.fragmented) |
| break; |
| |
| if (ptype.inner_prot == I40E_RX_PTYPE_INNER_PROT_UDP ) { |
| set_bit(XDP_META_PTYPE_UDP,hints.ptype); |
| udph = xdp->data + hints.l4hdroffset; |
| #ifdef PARSE_HEADERS |
| hints.srcport = htons(udph->source); |
| hints.dstport = htons(udph->dest); |
| #endif |
| } |
| else if (ptype.inner_prot == I40E_RX_PTYPE_INNER_PROT_TCP) { |
| set_bit(XDP_META_PTYPE_TCP, hints.ptype); |
| tcph = xdp->data + hints.l4hdroffset; |
| #ifdef PARSE_HEADERS |
| hints.srcport = htons(tcph->source); |
| hints.dstport = htons(tcph->dest); |
| #endif |
| } |
| else if (ptype.inner_prot == I40E_RX_PTYPE_INNER_PROT_ICMP) { |
| set_bit(XDP_META_PTYPE_ICMP, hints.ptype); |
| } |
| |
| |
| fltstatus = (stserr >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) & |
| I40E_RX_DESC_FLTSTAT_RSS_HASH; |
| if (fltstatus == I40E_RX_DESC_FLTSTAT_RSS_HASH) |
| hints.hash = rxdesc->wb.qword0.hi_dword.rss; |
| #ifdef PARSE_HEADERS |
| trace_printk("SrcAddr=%X DestAddr=%X srcport=%d dstport=%d", |
| hints.srcip.addr4, hints.dstip.addr4, hints.srcport, |
| hints.dstport); |
| #endif |
| }while(0); |
| |
| xdp->data_meta = xdp->data - sizeof(struct xdp_hw_hints); |
| memcpy(xdp->data_meta, &hints, sizeof(struct xdp_hw_hints)); |
| |
| end = rdtsc(); |
| trace_printk("Total cycles: %llu",end-start); |
| } |
| |
| /** |
| * i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf |
| * @rx_ring: rx descriptor ring to transact packets on |
| * @budget: Total limit on number of packets to process |
| * |
| * This function provides a "bounce buffer" approach to Rx interrupt |
| * processing. The advantage to this is that on systems that have |
| * expensive overhead for IOMMU access this provides a means of avoiding |
| * it by maintaining the mapping of the page to the system. |
| * |
| * Returns amount of work completed |
| **/ |
| static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget) |
| { |
| unsigned int total_rx_bytes = 0, total_rx_packets = 0; |
| struct sk_buff *skb = rx_ring->skb; |
| u16 cleaned_count = I40E_DESC_UNUSED(rx_ring); |
| bool failure = false, xdp_xmit = false; |
| struct i40e_pf *pf = rx_ring->vsi->back; |
| struct xdp_buff xdp; |
| |
| xdp.rxq = &rx_ring->xdp_rxq; |
| |
| while (likely(total_rx_packets < (unsigned int)budget)) { |
| struct i40e_rx_buffer *rx_buffer; |
| union i40e_rx_desc *rx_desc; |
| unsigned int size; |
| u16 vlan_tag; |
| u8 rx_ptype; |
| u64 qword; |
| |
| /* return some buffers to hardware, one at a time is too slow */ |
| if (cleaned_count >= I40E_RX_BUFFER_WRITE) { |
| failure = failure || |
| i40e_alloc_rx_buffers(rx_ring, cleaned_count); |
| cleaned_count = 0; |
| } |
| |
| rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean); |
| |
| /* status_error_len will always be zero for unused descriptors |
| * because it's cleared in cleanup, and overlaps with hdr_addr |
| * which is always zero because packet split isn't used, if the |
| * hardware wrote DD then the length will be non-zero |
| */ |
| qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| |
| /* This memory barrier is needed to keep us from reading |
| * any other fields out of the rx_desc until we have |
| * verified the descriptor has been written back. |
| */ |
| dma_rmb(); |
| |
| if (unlikely(i40e_rx_is_programming_status(qword))) { |
| i40e_clean_programming_status(rx_ring, rx_desc, qword); |
| cleaned_count++; |
| continue; |
| } |
| size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> |
| I40E_RXD_QW1_LENGTH_PBUF_SHIFT; |
| if (!size) |
| break; |
| |
| i40e_trace(clean_rx_irq, rx_ring, rx_desc, skb); |
| rx_buffer = i40e_get_rx_buffer(rx_ring, size); |
| |
| /* retrieve a buffer from the ring */ |
| if (!skb) { |
| xdp.data = page_address(rx_buffer->page) + |
| rx_buffer->page_offset; |
| xdp.data_meta = xdp.data; |
| xdp.data_hard_start = xdp.data - |
| i40e_rx_offset(rx_ring); |
| |
| /* Retrieve hints from HW if there is enough room |
| * available */ |
| if (pf->xdp_hint_level && (i40e_rx_offset(rx_ring) > |
| sizeof(struct xdp_hw_hints))) { |
| i40e_process_hints(rx_desc, &xdp); |
| } |
| xdp.data_end = xdp.data + size; |
| skb = i40e_run_xdp(rx_ring, &xdp); |
| } |
| |
| if (IS_ERR(skb)) { |
| if (PTR_ERR(skb) == -I40E_XDP_TX) { |
| xdp_xmit = true; |
| i40e_rx_buffer_flip(rx_ring, rx_buffer, size); |
| } else { |
| rx_buffer->pagecnt_bias++; |
| } |
| total_rx_bytes += size; |
| total_rx_packets++; |
| } else if (skb) { |
| i40e_add_rx_frag(rx_ring, rx_buffer, skb, size); |
| } else if (ring_uses_build_skb(rx_ring)) { |
| skb = i40e_build_skb(rx_ring, rx_buffer, &xdp); |
| } else { |
| skb = i40e_construct_skb(rx_ring, rx_buffer, &xdp); |
| } |
| |
| /* exit if we failed to retrieve a buffer */ |
| if (!skb) { |
| rx_ring->rx_stats.alloc_buff_failed++; |
| rx_buffer->pagecnt_bias++; |
| break; |
| } |
| |
| i40e_put_rx_buffer(rx_ring, rx_buffer); |
| cleaned_count++; |
| |
| if (i40e_is_non_eop(rx_ring, rx_desc, skb)) |
| continue; |
| |
| if (i40e_cleanup_headers(rx_ring, skb, rx_desc)) { |
| skb = NULL; |
| continue; |
| } |
| |
| /* probably a little skewed due to removing CRC */ |
| total_rx_bytes += skb->len; |
| |
| qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> |
| I40E_RXD_QW1_PTYPE_SHIFT; |
| |
| /* populate checksum, VLAN, and protocol */ |
| i40e_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype); |
| |
| vlan_tag = (qword & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)) ? |
| le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1) : 0; |
| |
| i40e_trace(clean_rx_irq_rx, rx_ring, rx_desc, skb); |
| i40e_receive_skb(rx_ring, skb, vlan_tag); |
| skb = NULL; |
| |
| /* update budget accounting */ |
| total_rx_packets++; |
| } |
| |
| if (xdp_xmit) { |
| struct i40e_ring *xdp_ring = |
| rx_ring->vsi->xdp_rings[rx_ring->queue_index]; |
| |
| i40e_xdp_ring_update_tail(xdp_ring); |
| xdp_do_flush_map(); |
| } |
| |
| rx_ring->skb = skb; |
| |
| u64_stats_update_begin(&rx_ring->syncp); |
| rx_ring->stats.packets += total_rx_packets; |
| rx_ring->stats.bytes += total_rx_bytes; |
| u64_stats_update_end(&rx_ring->syncp); |
| rx_ring->q_vector->rx.total_packets += total_rx_packets; |
| rx_ring->q_vector->rx.total_bytes += total_rx_bytes; |
| |
| /* guarantee a trip back through this routine if there was a failure */ |
| return failure ? budget : (int)total_rx_packets; |
| } |
| |
| static inline u32 i40e_buildreg_itr(const int type, u16 itr) |
| { |
| u32 val; |
| |
| /* We don't bother with setting the CLEARPBA bit as the data sheet |
| * points out doing so is "meaningless since it was already |
| * auto-cleared". The auto-clearing happens when the interrupt is |
| * asserted. |
| * |
| * Hardware errata 28 for also indicates that writing to a |
| * xxINT_DYN_CTLx CSR with INTENA_MSK (bit 31) set to 0 will clear |
| * an event in the PBA anyway so we need to rely on the automask |
| * to hold pending events for us until the interrupt is re-enabled |
| * |
| * The itr value is reported in microseconds, and the register |
| * value is recorded in 2 microsecond units. For this reason we |
| * only need to shift by the interval shift - 1 instead of the |
| * full value. |
| */ |
| itr &= I40E_ITR_MASK; |
| |
| val = I40E_PFINT_DYN_CTLN_INTENA_MASK | |
| (type << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT) | |
| (itr << (I40E_PFINT_DYN_CTLN_INTERVAL_SHIFT - 1)); |
| |
| return val; |
| } |
| |
| /* a small macro to shorten up some long lines */ |
| #define INTREG I40E_PFINT_DYN_CTLN |
| |
| /* The act of updating the ITR will cause it to immediately trigger. In order |
| * to prevent this from throwing off adaptive update statistics we defer the |
| * update so that it can only happen so often. So after either Tx or Rx are |
| * updated we make the adaptive scheme wait until either the ITR completely |
| * expires via the next_update expiration or we have been through at least |
| * 3 interrupts. |
| */ |
| #define ITR_COUNTDOWN_START 3 |
| |
| /** |
| * i40e_update_enable_itr - Update itr and re-enable MSIX interrupt |
| * @vsi: the VSI we care about |
| * @q_vector: q_vector for which itr is being updated and interrupt enabled |
| * |
| **/ |
| static inline void i40e_update_enable_itr(struct i40e_vsi *vsi, |
| struct i40e_q_vector *q_vector) |
| { |
| struct i40e_hw *hw = &vsi->back->hw; |
| u32 intval; |
| |
| /* If we don't have MSIX, then we only need to re-enable icr0 */ |
| if (!(vsi->back->flags & I40E_FLAG_MSIX_ENABLED)) { |
| i40e_irq_dynamic_enable_icr0(vsi->back); |
| return; |
| } |
| |
| /* These will do nothing if dynamic updates are not enabled */ |
| i40e_update_itr(q_vector, &q_vector->tx); |
| i40e_update_itr(q_vector, &q_vector->rx); |
| |
| /* This block of logic allows us to get away with only updating |
| * one ITR value with each interrupt. The idea is to perform a |
| * pseudo-lazy update with the following criteria. |
| * |
| * 1. Rx is given higher priority than Tx if both are in same state |
| * 2. If we must reduce an ITR that is given highest priority. |
| * 3. We then give priority to increasing ITR based on amount. |
| */ |
| if (q_vector->rx.target_itr < q_vector->rx.current_itr) { |
| /* Rx ITR needs to be reduced, this is highest priority */ |
| intval = i40e_buildreg_itr(I40E_RX_ITR, |
| q_vector->rx.target_itr); |
| q_vector->rx.current_itr = q_vector->rx.target_itr; |
| q_vector->itr_countdown = ITR_COUNTDOWN_START; |
| } else if ((q_vector->tx.target_itr < q_vector->tx.current_itr) || |
| ((q_vector->rx.target_itr - q_vector->rx.current_itr) < |
| (q_vector->tx.target_itr - q_vector->tx.current_itr))) { |
| /* Tx ITR needs to be reduced, this is second priority |
| * Tx ITR needs to be increased more than Rx, fourth priority |
| */ |
| intval = i40e_buildreg_itr(I40E_TX_ITR, |
| q_vector->tx.target_itr); |
| q_vector->tx.current_itr = q_vector->tx.target_itr; |
| q_vector->itr_countdown = ITR_COUNTDOWN_START; |
| } else if (q_vector->rx.current_itr != q_vector->rx.target_itr) { |
| /* Rx ITR needs to be increased, third priority */ |
| intval = i40e_buildreg_itr(I40E_RX_ITR, |
| q_vector->rx.target_itr); |
| q_vector->rx.current_itr = q_vector->rx.target_itr; |
| q_vector->itr_countdown = ITR_COUNTDOWN_START; |
| } else { |
| /* No ITR update, lowest priority */ |
| intval = i40e_buildreg_itr(I40E_ITR_NONE, 0); |
| if (q_vector->itr_countdown) |
| q_vector->itr_countdown--; |
| } |
| |
| if (!test_bit(__I40E_VSI_DOWN, vsi->state)) |
| wr32(hw, INTREG(q_vector->reg_idx), intval); |
| } |
| |
| /** |
| * i40e_napi_poll - NAPI polling Rx/Tx cleanup routine |
| * @napi: napi struct with our devices info in it |
| * @budget: amount of work driver is allowed to do this pass, in packets |
| * |
| * This function will clean all queues associated with a q_vector. |
| * |
| * Returns the amount of work done |
| **/ |
| int i40e_napi_poll(struct napi_struct *napi, int budget) |
| { |
| struct i40e_q_vector *q_vector = |
| container_of(napi, struct i40e_q_vector, napi); |
| struct i40e_vsi *vsi = q_vector->vsi; |
| struct i40e_ring *ring; |
| bool clean_complete = true; |
| bool arm_wb = false; |
| int budget_per_ring; |
| int work_done = 0; |
| |
| if (test_bit(__I40E_VSI_DOWN, vsi->state)) { |
| napi_complete(napi); |
| return 0; |
| } |
| |
| /* Since the actual Tx work is minimal, we can give the Tx a larger |
| * budget and be more aggressive about cleaning up the Tx descriptors. |
| */ |
| i40e_for_each_ring(ring, q_vector->tx) { |
| if (!i40e_clean_tx_irq(vsi, ring, budget)) { |
| clean_complete = false; |
| continue; |
| } |
| arm_wb |= ring->arm_wb; |
| ring->arm_wb = false; |
| } |
| |
| /* Handle case where we are called by netpoll with a budget of 0 */ |
| if (budget <= 0) |
| goto tx_only; |
| |
| /* We attempt to distribute budget to each Rx queue fairly, but don't |
| * allow the budget to go below 1 because that would exit polling early. |
| */ |
| budget_per_ring = max(budget/q_vector->num_ringpairs, 1); |
| |
| i40e_for_each_ring(ring, q_vector->rx) { |
| int cleaned = i40e_clean_rx_irq(ring, budget_per_ring); |
| |
| work_done += cleaned; |
| /* if we clean as many as budgeted, we must not be done */ |
| if (cleaned >= budget_per_ring) |
| clean_complete = false; |
| } |
| |
| /* If work not completed, return budget and polling will return */ |
| if (!clean_complete) { |
| int cpu_id = smp_processor_id(); |
| |
| /* It is possible that the interrupt affinity has changed but, |
| * if the cpu is pegged at 100%, polling will never exit while |
| * traffic continues and the interrupt will be stuck on this |
| * cpu. We check to make sure affinity is correct before we |
| * continue to poll, otherwise we must stop polling so the |
| * interrupt can move to the correct cpu. |
| */ |
| if (!cpumask_test_cpu(cpu_id, &q_vector->affinity_mask)) { |
| /* Tell napi that we are done polling */ |
| napi_complete_done(napi, work_done); |
| |
| /* Force an interrupt */ |
| i40e_force_wb(vsi, q_vector); |
| |
| /* Return budget-1 so that polling stops */ |
| return budget - 1; |
| } |
| tx_only: |
| if (arm_wb) { |
| q_vector->tx.ring[0].tx_stats.tx_force_wb++; |
| i40e_enable_wb_on_itr(vsi, q_vector); |
| } |
| return budget; |
| } |
| |
| if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR) |
| q_vector->arm_wb_state = false; |
| |
| /* Work is done so exit the polling mode and re-enable the interrupt */ |
| napi_complete_done(napi, work_done); |
| |
| i40e_update_enable_itr(vsi, q_vector); |
| |
| return min(work_done, budget - 1); |
| } |
| |
| /** |
| * i40e_atr - Add a Flow Director ATR filter |
| * @tx_ring: ring to add programming descriptor to |
| * @skb: send buffer |
| * @tx_flags: send tx flags |
| **/ |
| static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb, |
| u32 tx_flags) |
| { |
| struct i40e_filter_program_desc *fdir_desc; |
| struct i40e_pf *pf = tx_ring->vsi->back; |
| union { |
| unsigned char *network; |
| struct iphdr *ipv4; |
| struct ipv6hdr *ipv6; |
| } hdr; |
| struct tcphdr *th; |
| unsigned int hlen; |
| u32 flex_ptype, dtype_cmd; |
| int l4_proto; |
| u16 i; |
| |
| /* make sure ATR is enabled */ |
| if (!(pf->flags & I40E_FLAG_FD_ATR_ENABLED)) |
| return; |
| |
| if (test_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state)) |
| return; |
| |
| /* if sampling is disabled do nothing */ |
| if (!tx_ring->atr_sample_rate) |
| return; |
| |
| /* Currently only IPv4/IPv6 with TCP is supported */ |
| if (!(tx_flags & (I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6))) |
| return; |
| |
| /* snag network header to get L4 type and address */ |
| hdr.network = (tx_flags & I40E_TX_FLAGS_UDP_TUNNEL) ? |
| skb_inner_network_header(skb) : skb_network_header(skb); |
| |
| /* Note: tx_flags gets modified to reflect inner protocols in |
| * tx_enable_csum function if encap is enabled. |
| */ |
| if (tx_flags & I40E_TX_FLAGS_IPV4) { |
| /* access ihl as u8 to avoid unaligned access on ia64 */ |
| hlen = (hdr.network[0] & 0x0F) << 2; |
| l4_proto = hdr.ipv4->protocol; |
| } else { |
| /* find the start of the innermost ipv6 header */ |
| unsigned int inner_hlen = hdr.network - skb->data; |
| unsigned int h_offset = inner_hlen; |
| |
| /* this function updates h_offset to the end of the header */ |
| l4_proto = |
| ipv6_find_hdr(skb, &h_offset, IPPROTO_TCP, NULL, NULL); |
| /* hlen will contain our best estimate of the tcp header */ |
| hlen = h_offset - inner_hlen; |
| } |
| |
| if (l4_proto != IPPROTO_TCP) |
| return; |
| |
| th = (struct tcphdr *)(hdr.network + hlen); |
| |
| /* Due to lack of space, no more new filters can be programmed */ |
| if (th->syn && test_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state)) |
| return; |
| if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) { |
| /* HW ATR eviction will take care of removing filters on FIN |
| * and RST packets. |
| */ |
| if (th->fin || th->rst) |
| return; |
| } |
| |
| tx_ring->atr_count++; |
| |
| /* sample on all syn/fin/rst packets or once every atr sample rate */ |
| if (!th->fin && |
| !th->syn && |
| !th->rst && |
| (tx_ring->atr_count < tx_ring->atr_sample_rate)) |
| return; |
| |
| tx_ring->atr_count = 0; |
| |
| /* grab the next descriptor */ |
| i = tx_ring->next_to_use; |
| fdir_desc = I40E_TX_FDIRDESC(tx_ring, i); |
| |
| i++; |
| tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; |
| |
| flex_ptype = (tx_ring->queue_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) & |
| I40E_TXD_FLTR_QW0_QINDEX_MASK; |
| flex_ptype |= (tx_flags & I40E_TX_FLAGS_IPV4) ? |
| (I40E_FILTER_PCTYPE_NONF_IPV4_TCP << |
| I40E_TXD_FLTR_QW0_PCTYPE_SHIFT) : |
| (I40E_FILTER_PCTYPE_NONF_IPV6_TCP << |
| I40E_TXD_FLTR_QW0_PCTYPE_SHIFT); |
| |
| flex_ptype |= tx_ring->vsi->id << I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT; |
| |
| dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG; |
| |
| dtype_cmd |= (th->fin || th->rst) ? |
| (I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE << |
| I40E_TXD_FLTR_QW1_PCMD_SHIFT) : |
| (I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE << |
| I40E_TXD_FLTR_QW1_PCMD_SHIFT); |
| |
| dtype_cmd |= I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX << |
| I40E_TXD_FLTR_QW1_DEST_SHIFT; |
| |
| dtype_cmd |= I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID << |
| I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT; |
| |
| dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK; |
| if (!(tx_flags & I40E_TX_FLAGS_UDP_TUNNEL)) |
| dtype_cmd |= |
| ((u32)I40E_FD_ATR_STAT_IDX(pf->hw.pf_id) << |
| I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) & |
| I40E_TXD_FLTR_QW1_CNTINDEX_MASK; |
| else |
| dtype_cmd |= |
| ((u32)I40E_FD_ATR_TUNNEL_STAT_IDX(pf->hw.pf_id) << |
| I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) & |
| I40E_TXD_FLTR_QW1_CNTINDEX_MASK; |
| |
| if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) |
| dtype_cmd |= I40E_TXD_FLTR_QW1_ATR_MASK; |
| |
| fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype); |
| fdir_desc->rsvd = cpu_to_le32(0); |
| fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd); |
| fdir_desc->fd_id = cpu_to_le32(0); |
| } |
| |
| /** |
| * i40e_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW |
| * @skb: send buffer |
| * @tx_ring: ring to send buffer on |
| * @flags: the tx flags to be set |
| * |
| * Checks the skb and set up correspondingly several generic transmit flags |
| * related to VLAN tagging for the HW, such as VLAN, DCB, etc. |
| * |
| * Returns error code indicate the frame should be dropped upon error and the |
| * otherwise returns 0 to indicate the flags has been set properly. |
| **/ |
| static inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb, |
| struct i40e_ring *tx_ring, |
| u32 *flags) |
| { |
| __be16 protocol = skb->protocol; |
| u32 tx_flags = 0; |
| |
| if (protocol == htons(ETH_P_8021Q) && |
| !(tx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_TX)) { |
| /* When HW VLAN acceleration is turned off by the user the |
| * stack sets the protocol to 8021q so that the driver |
| * can take any steps required to support the SW only |
| * VLAN handling. In our case the driver doesn't need |
| * to take any further steps so just set the protocol |
| * to the encapsulated ethertype. |
| */ |
| skb->protocol = vlan_get_protocol(skb); |
| goto out; |
| } |
| |
| /* if we have a HW VLAN tag being added, default to the HW one */ |
| if (skb_vlan_tag_present(skb)) { |
| tx_flags |= skb_vlan_tag_get(skb) << I40E_TX_FLAGS_VLAN_SHIFT; |
| tx_flags |= I40E_TX_FLAGS_HW_VLAN; |
| /* else if it is a SW VLAN, check the next protocol and store the tag */ |
| } else if (protocol == htons(ETH_P_8021Q)) { |
| struct vlan_hdr *vhdr, _vhdr; |
| |
| vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(_vhdr), &_vhdr); |
| if (!vhdr) |
| return -EINVAL; |
| |
| protocol = vhdr->h_vlan_encapsulated_proto; |
| tx_flags |= ntohs(vhdr->h_vlan_TCI) << I40E_TX_FLAGS_VLAN_SHIFT; |
| tx_flags |= I40E_TX_FLAGS_SW_VLAN; |
| } |
| |
| if (!(tx_ring->vsi->back->flags & I40E_FLAG_DCB_ENABLED)) |
| goto out; |
| |
| /* Insert 802.1p priority into VLAN header */ |
| if ((tx_flags & (I40E_TX_FLAGS_HW_VLAN | I40E_TX_FLAGS_SW_VLAN)) || |
| (skb->priority != TC_PRIO_CONTROL)) { |
| tx_flags &= ~I40E_TX_FLAGS_VLAN_PRIO_MASK; |
| tx_flags |= (skb->priority & 0x7) << |
| I40E_TX_FLAGS_VLAN_PRIO_SHIFT; |
| if (tx_flags & I40E_TX_FLAGS_SW_VLAN) { |
| struct vlan_ethhdr *vhdr; |
| int rc; |
| |
| rc = skb_cow_head(skb, 0); |
| if (rc < 0) |
| return rc; |
| vhdr = (struct vlan_ethhdr *)skb->data; |
| vhdr->h_vlan_TCI = htons(tx_flags >> |
| I40E_TX_FLAGS_VLAN_SHIFT); |
| } else { |
| tx_flags |= I40E_TX_FLAGS_HW_VLAN; |
| } |
| } |
| |
| out: |
| *flags = tx_flags; |
| return 0; |
| } |
| |
| /** |
| * i40e_tso - set up the tso context descriptor |
| * @first: pointer to first Tx buffer for xmit |
| * @hdr_len: ptr to the size of the packet header |
| * @cd_type_cmd_tso_mss: Quad Word 1 |
| * |
| * Returns 0 if no TSO can happen, 1 if tso is going, or error |
| **/ |
| static int i40e_tso(struct i40e_tx_buffer *first, u8 *hdr_len, |
| u64 *cd_type_cmd_tso_mss) |
| { |
| struct sk_buff *skb = first->skb; |
| u64 cd_cmd, cd_tso_len, cd_mss; |
| union { |
| struct iphdr *v4; |
| struct ipv6hdr *v6; |
| unsigned char *hdr; |
| } ip; |
| union { |
| struct tcphdr *tcp; |
| struct udphdr *udp; |
| unsigned char *hdr; |
| } l4; |
| u32 paylen, l4_offset; |
| u16 gso_segs, gso_size; |
| int err; |
| |
| if (skb->ip_summed != CHECKSUM_PARTIAL) |
| return 0; |
| |
| if (!skb_is_gso(skb)) |
| return 0; |
| |
| err = skb_cow_head(skb, 0); |
| if (err < 0) |
| return err; |
| |
| ip.hdr = skb_network_header(skb); |
| l4.hdr = skb_transport_header(skb); |
| |
| /* initialize outer IP header fields */ |
| if (ip.v4->version == 4) { |
| ip.v4->tot_len = 0; |
| ip.v4->check = 0; |
| } else { |
| ip.v6->payload_len = 0; |
| } |
| |
| if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE | |
| SKB_GSO_GRE_CSUM | |
| SKB_GSO_IPXIP4 | |
| SKB_GSO_IPXIP6 | |
| SKB_GSO_UDP_TUNNEL | |
| SKB_GSO_UDP_TUNNEL_CSUM)) { |
| if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) && |
| (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) { |
| l4.udp->len = 0; |
| |
| /* determine offset of outer transport header */ |
| l4_offset = l4.hdr - skb->data; |
| |
| /* remove payload length from outer checksum */ |
| paylen = skb->len - l4_offset; |
| csum_replace_by_diff(&l4.udp->check, |
| (__force __wsum)htonl(paylen)); |
| } |
| |
| /* reset pointers to inner headers */ |
| ip.hdr = skb_inner_network_header(skb); |
| l4.hdr = skb_inner_transport_header(skb); |
| |
| /* initialize inner IP header fields */ |
| if (ip.v4->version == 4) { |
| ip.v4->tot_len = 0; |
| ip.v4->check = 0; |
| } else { |
| ip.v6->payload_len = 0; |
| } |
| } |
| |
| /* determine offset of inner transport header */ |
| l4_offset = l4.hdr - skb->data; |
| |
| /* remove payload length from inner checksum */ |
| paylen = skb->len - l4_offset; |
| csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen)); |
| |
| /* compute length of segmentation header */ |
| *hdr_len = (l4.tcp->doff * 4) + l4_offset; |
| |
| /* pull values out of skb_shinfo */ |
| gso_size = skb_shinfo(skb)->gso_size; |
| gso_segs = skb_shinfo(skb)->gso_segs; |
| |
| /* update GSO size and bytecount with header size */ |
| first->gso_segs = gso_segs; |
| first->bytecount += (first->gso_segs - 1) * *hdr_len; |
| |
| /* find the field values */ |
| cd_cmd = I40E_TX_CTX_DESC_TSO; |
| cd_tso_len = skb->len - *hdr_len; |
| cd_mss = gso_size; |
| *cd_type_cmd_tso_mss |= (cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | |
| (cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | |
| (cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); |
| return 1; |
| } |
| |
| /** |
| * i40e_tsyn - set up the tsyn context descriptor |
| * @tx_ring: ptr to the ring to send |
| * @skb: ptr to the skb we're sending |
| * @tx_flags: the collected send information |
| * @cd_type_cmd_tso_mss: Quad Word 1 |
| * |
| * Returns 0 if no Tx timestamp can happen and 1 if the timestamp will happen |
| **/ |
| static int i40e_tsyn(struct i40e_ring *tx_ring, struct sk_buff *skb, |
| u32 tx_flags, u64 *cd_type_cmd_tso_mss) |
| { |
| struct i40e_pf *pf; |
| |
| if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))) |
| return 0; |
| |
| /* Tx timestamps cannot be sampled when doing TSO */ |
| if (tx_flags & I40E_TX_FLAGS_TSO) |
| return 0; |
| |
| /* only timestamp the outbound packet if the user has requested it and |
| * we are not already transmitting a packet to be timestamped |
| */ |
| pf = i40e_netdev_to_pf(tx_ring->netdev); |
| if (!(pf->flags & I40E_FLAG_PTP)) |
| return 0; |
| |
| if (pf->ptp_tx && |
| !test_and_set_bit_lock(__I40E_PTP_TX_IN_PROGRESS, pf->state)) { |
| skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; |
| pf->ptp_tx_start = jiffies; |
| pf->ptp_tx_skb = skb_get(skb); |
| } else { |
| pf->tx_hwtstamp_skipped++; |
| return 0; |
| } |
| |
| *cd_type_cmd_tso_mss |= (u64)I40E_TX_CTX_DESC_TSYN << |
| I40E_TXD_CTX_QW1_CMD_SHIFT; |
| |
| return 1; |
| } |
| |
| /** |
| * i40e_tx_enable_csum - Enable Tx checksum offloads |
| * @skb: send buffer |
| * @tx_flags: pointer to Tx flags currently set |
| * @td_cmd: Tx descriptor command bits to set |
| * @td_offset: Tx descriptor header offsets to set |
| * @tx_ring: Tx descriptor ring |
| * @cd_tunneling: ptr to context desc bits |
| **/ |
| static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags, |
| u32 *td_cmd, u32 *td_offset, |
| struct i40e_ring *tx_ring, |
| u32 *cd_tunneling) |
| { |
| union { |
| struct iphdr *v4; |
| struct ipv6hdr *v6; |
| unsigned char *hdr; |
| } ip; |
| union { |
| struct tcphdr *tcp; |
| struct udphdr *udp; |
| unsigned char |