forked from Minki/linux
net: thunderx: Optimize CQE_TX handling
Optimized CQE handling with below changes - Feeing descriptors back to SQ in bulk i.e once per NAPI instance instead for every CQE_TX, this will reduce number of atomic updates to 'sq->free_cnt'. - Checking errors in CQE_TX and CQE_RX before calling appropriate fn()s to update error stats i.e reduce branching. Also removed debug messages in packet handling path which otherwise causes issues if DEBUG is enabled. Signed-off-by: Sunil Goutham <sgoutham@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sunil Goutham
David S. Miller
parent
5e848e4c5d
commit
0dada88b8c
@ -498,7 +498,7 @@ static int nicvf_init_resources(struct nicvf *nic)
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static void nicvf_snd_pkt_handler(struct net_device *netdev,
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struct cqe_send_t *cqe_tx,
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int cqe_type, int budget,
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int budget, int *subdesc_cnt,
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unsigned int *tx_pkts, unsigned int *tx_bytes)
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{
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struct sk_buff *skb = NULL;
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@ -513,12 +513,10 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
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if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER)
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return;
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netdev_dbg(nic->netdev,
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"%s Qset #%d SQ #%d SQ ptr #%d subdesc count %d\n",
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__func__, cqe_tx->sq_qs, cqe_tx->sq_idx,
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cqe_tx->sqe_ptr, hdr->subdesc_cnt);
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/* Check for errors */
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if (cqe_tx->send_status)
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nicvf_check_cqe_tx_errs(nic->pnicvf, cqe_tx);
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nicvf_check_cqe_tx_errs(nic, cqe_tx);
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skb = (struct sk_buff *)sq->skbuff[cqe_tx->sqe_ptr];
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if (skb) {
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/* Check for dummy descriptor used for HW TSO offload on 88xx */
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@ -528,12 +526,12 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
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(struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2);
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nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2,
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tso_sqe->subdesc_cnt);
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nicvf_put_sq_desc(sq, tso_sqe->subdesc_cnt + 1);
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*subdesc_cnt += tso_sqe->subdesc_cnt + 1;
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} else {
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nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr,
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hdr->subdesc_cnt);
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}
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nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
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*subdesc_cnt += hdr->subdesc_cnt + 1;
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prefetch(skb);
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(*tx_pkts)++;
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*tx_bytes += skb->len;
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@ -544,7 +542,7 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
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* a SKB attached, so just free SQEs here.
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*/
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if (!nic->hw_tso)
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nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
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*subdesc_cnt += hdr->subdesc_cnt + 1;
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}
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}
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@ -595,9 +593,11 @@ static void nicvf_rcv_pkt_handler(struct net_device *netdev,
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}
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/* Check for errors */
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err = nicvf_check_cqe_rx_errs(nic, cqe_rx);
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if (err && !cqe_rx->rb_cnt)
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return;
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if (cqe_rx->err_level || cqe_rx->err_opcode) {
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err = nicvf_check_cqe_rx_errs(nic, cqe_rx);
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if (err && !cqe_rx->rb_cnt)
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return;
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}
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skb = nicvf_get_rcv_skb(snic, cqe_rx);
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if (!skb) {
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@ -646,6 +646,7 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
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{
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int processed_cqe, work_done = 0, tx_done = 0;
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int cqe_count, cqe_head;
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int subdesc_cnt = 0;
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struct nicvf *nic = netdev_priv(netdev);
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struct queue_set *qs = nic->qs;
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struct cmp_queue *cq = &qs->cq[cq_idx];
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@ -667,8 +668,6 @@ loop:
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cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9;
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cqe_head &= 0xFFFF;
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netdev_dbg(nic->netdev, "%s CQ%d cqe_count %d cqe_head %d\n",
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__func__, cq_idx, cqe_count, cqe_head);
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while (processed_cqe < cqe_count) {
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/* Get the CQ descriptor */
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cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
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@ -682,17 +681,15 @@ loop:
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break;
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}
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netdev_dbg(nic->netdev, "CQ%d cq_desc->cqe_type %d\n",
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cq_idx, cq_desc->cqe_type);
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switch (cq_desc->cqe_type) {
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case CQE_TYPE_RX:
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nicvf_rcv_pkt_handler(netdev, napi, cq_desc);
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work_done++;
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break;
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case CQE_TYPE_SEND:
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nicvf_snd_pkt_handler(netdev,
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(void *)cq_desc, CQE_TYPE_SEND,
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budget, &tx_pkts, &tx_bytes);
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nicvf_snd_pkt_handler(netdev, (void *)cq_desc,
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budget, &subdesc_cnt,
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&tx_pkts, &tx_bytes);
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tx_done++;
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break;
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case CQE_TYPE_INVALID:
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@ -704,9 +701,6 @@ loop:
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}
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processed_cqe++;
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}
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netdev_dbg(nic->netdev,
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"%s CQ%d processed_cqe %d work_done %d budget %d\n",
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__func__, cq_idx, processed_cqe, work_done, budget);
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/* Ring doorbell to inform H/W to reuse processed CQEs */
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nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR,
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@ -716,8 +710,12 @@ loop:
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goto loop;
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done:
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/* Wakeup TXQ if its stopped earlier due to SQ full */
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sq = &nic->qs->sq[cq_idx];
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/* Update SQ's descriptor free count */
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if (subdesc_cnt)
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nicvf_put_sq_desc(sq, subdesc_cnt);
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/* Wakeup TXQ if its stopped earlier due to SQ full */
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if (tx_done ||
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(atomic_read(&sq->free_cnt) >= MIN_SQ_DESC_PER_PKT_XMIT)) {
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netdev = nic->pnicvf->netdev;
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@ -1640,9 +1640,6 @@ void nicvf_update_sq_stats(struct nicvf *nic, int sq_idx)
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/* Check for errors in the receive cmp.queue entry */
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int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
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{
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if (!cqe_rx->err_level && !cqe_rx->err_opcode)
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return 0;
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if (netif_msg_rx_err(nic))
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netdev_err(nic->netdev,
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"%s: RX error CQE err_level 0x%x err_opcode 0x%x\n",
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@ -1731,8 +1728,6 @@ int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
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int nicvf_check_cqe_tx_errs(struct nicvf *nic, struct cqe_send_t *cqe_tx)
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{
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switch (cqe_tx->send_status) {
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case CQ_TX_ERROP_GOOD:
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return 0;
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case CQ_TX_ERROP_DESC_FAULT:
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this_cpu_inc(nic->drv_stats->tx_desc_fault);
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break;
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