From 0dada88b8cd74569abc3dda50f1b268a5868f6f2 Mon Sep 17 00:00:00 2001 From: Sunil Goutham Date: Tue, 2 May 2017 18:36:52 +0530 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- .../net/ethernet/cavium/thunder/nicvf_main.c | 44 +++++++++---------- .../ethernet/cavium/thunder/nicvf_queues.c | 5 --- 2 files changed, 21 insertions(+), 28 deletions(-) diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c index 81a2fcb3cb1b..0d79894400ab 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c @@ -498,7 +498,7 @@ static int nicvf_init_resources(struct nicvf *nic) static void nicvf_snd_pkt_handler(struct net_device *netdev, struct cqe_send_t *cqe_tx, - int cqe_type, int budget, + int budget, int *subdesc_cnt, unsigned int *tx_pkts, unsigned int *tx_bytes) { struct sk_buff *skb = NULL; @@ -513,12 +513,10 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev, if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER) return; - netdev_dbg(nic->netdev, - "%s Qset #%d SQ #%d SQ ptr #%d subdesc count %d\n", - __func__, cqe_tx->sq_qs, cqe_tx->sq_idx, - cqe_tx->sqe_ptr, hdr->subdesc_cnt); + /* Check for errors */ + if (cqe_tx->send_status) + nicvf_check_cqe_tx_errs(nic->pnicvf, cqe_tx); - nicvf_check_cqe_tx_errs(nic, cqe_tx); skb = (struct sk_buff *)sq->skbuff[cqe_tx->sqe_ptr]; if (skb) { /* Check for dummy descriptor used for HW TSO offload on 88xx */ @@ -528,12 +526,12 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev, (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2); nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2, tso_sqe->subdesc_cnt); - nicvf_put_sq_desc(sq, tso_sqe->subdesc_cnt + 1); + *subdesc_cnt += tso_sqe->subdesc_cnt + 1; } else { nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr, hdr->subdesc_cnt); } - nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1); + *subdesc_cnt += hdr->subdesc_cnt + 1; prefetch(skb); (*tx_pkts)++; *tx_bytes += skb->len; @@ -544,7 +542,7 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev, * a SKB attached, so just free SQEs here. */ if (!nic->hw_tso) - nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1); + *subdesc_cnt += hdr->subdesc_cnt + 1; } } @@ -595,9 +593,11 @@ static void nicvf_rcv_pkt_handler(struct net_device *netdev, } /* Check for errors */ - err = nicvf_check_cqe_rx_errs(nic, cqe_rx); - if (err && !cqe_rx->rb_cnt) - return; + if (cqe_rx->err_level || cqe_rx->err_opcode) { + err = nicvf_check_cqe_rx_errs(nic, cqe_rx); + if (err && !cqe_rx->rb_cnt) + return; + } skb = nicvf_get_rcv_skb(snic, cqe_rx); if (!skb) { @@ -646,6 +646,7 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, { int processed_cqe, work_done = 0, tx_done = 0; int cqe_count, cqe_head; + int subdesc_cnt = 0; struct nicvf *nic = netdev_priv(netdev); struct queue_set *qs = nic->qs; struct cmp_queue *cq = &qs->cq[cq_idx]; @@ -667,8 +668,6 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9; cqe_head &= 0xFFFF; - netdev_dbg(nic->netdev, "%s CQ%d cqe_count %d cqe_head %d\n", - __func__, cq_idx, cqe_count, cqe_head); while (processed_cqe < cqe_count) { /* Get the CQ descriptor */ cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head); @@ -682,17 +681,15 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, break; } - netdev_dbg(nic->netdev, "CQ%d cq_desc->cqe_type %d\n", - cq_idx, cq_desc->cqe_type); switch (cq_desc->cqe_type) { case CQE_TYPE_RX: nicvf_rcv_pkt_handler(netdev, napi, cq_desc); work_done++; break; case CQE_TYPE_SEND: - nicvf_snd_pkt_handler(netdev, - (void *)cq_desc, CQE_TYPE_SEND, - budget, &tx_pkts, &tx_bytes); + nicvf_snd_pkt_handler(netdev, (void *)cq_desc, + budget, &subdesc_cnt, + &tx_pkts, &tx_bytes); tx_done++; break; case CQE_TYPE_INVALID: @@ -704,9 +701,6 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, } processed_cqe++; } - netdev_dbg(nic->netdev, - "%s CQ%d processed_cqe %d work_done %d budget %d\n", - __func__, cq_idx, processed_cqe, work_done, budget); /* Ring doorbell to inform H/W to reuse processed CQEs */ nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR, @@ -716,8 +710,12 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, goto loop; done: - /* Wakeup TXQ if its stopped earlier due to SQ full */ sq = &nic->qs->sq[cq_idx]; + /* Update SQ's descriptor free count */ + if (subdesc_cnt) + nicvf_put_sq_desc(sq, subdesc_cnt); + + /* Wakeup TXQ if its stopped earlier due to SQ full */ if (tx_done || (atomic_read(&sq->free_cnt) >= MIN_SQ_DESC_PER_PKT_XMIT)) { netdev = nic->pnicvf->netdev; diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index dfc85a169127..90c5bc7d7344 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -1640,9 +1640,6 @@ void nicvf_update_sq_stats(struct nicvf *nic, int sq_idx) /* Check for errors in the receive cmp.queue entry */ int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx) { - if (!cqe_rx->err_level && !cqe_rx->err_opcode) - return 0; - if (netif_msg_rx_err(nic)) netdev_err(nic->netdev, "%s: RX error CQE err_level 0x%x err_opcode 0x%x\n", @@ -1731,8 +1728,6 @@ int nicvf_check_cqe_rx_errs(struct nicvf *nic, struct cqe_rx_t *cqe_rx) int nicvf_check_cqe_tx_errs(struct nicvf *nic, struct cqe_send_t *cqe_tx) { switch (cqe_tx->send_status) { - case CQ_TX_ERROP_GOOD: - return 0; case CQ_TX_ERROP_DESC_FAULT: this_cpu_inc(nic->drv_stats->tx_desc_fault); break;