bnxt: count discards due to memory allocation errors

Count packets dropped due to buffer or skb allocation errors.
Report as part of rx_dropped.

v2: drop the ethtool -S entry [Vladimir]

Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index df255d4..ccf1e47 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1651,6 +1651,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
                skb = bnxt_copy_skb(bnapi, data_ptr, len, mapping);
                if (!skb) {
                        bnxt_abort_tpa(cpr, idx, agg_bufs);
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        return NULL;
                }
        } else {
@@ -1660,6 +1661,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
                new_data = __bnxt_alloc_rx_data(bp, &new_mapping, GFP_ATOMIC);
                if (!new_data) {
                        bnxt_abort_tpa(cpr, idx, agg_bufs);
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        return NULL;
                }
 
@@ -1675,6 +1677,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
                if (!skb) {
                        kfree(data);
                        bnxt_abort_tpa(cpr, idx, agg_bufs);
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        return NULL;
                }
                skb_reserve(skb, bp->rx_offset);
@@ -1685,6 +1688,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
                skb = bnxt_rx_pages(bp, cpr, skb, idx, agg_bufs, true);
                if (!skb) {
                        /* Page reuse already handled by bnxt_rx_pages(). */
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        return NULL;
                }
        }
@@ -1888,6 +1892,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
                        if (agg_bufs)
                                bnxt_reuse_rx_agg_bufs(cpr, cp_cons, 0,
                                                       agg_bufs, false);
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        rc = -ENOMEM;
                        goto next_rx;
                }
@@ -1901,6 +1906,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
                skb = bp->rx_skb_func(bp, rxr, cons, data, data_ptr, dma_addr,
                                      payload | len);
                if (!skb) {
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        rc = -ENOMEM;
                        goto next_rx;
                }
@@ -1909,6 +1915,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
        if (agg_bufs) {
                skb = bnxt_rx_pages(bp, cpr, skb, cp_cons, agg_bufs, false);
                if (!skb) {
+                       cpr->sw_stats.rx.rx_oom_discards += 1;
                        rc = -ENOMEM;
                        goto next_rx;
                }
@@ -10651,7 +10658,9 @@ static void bnxt_get_ring_stats(struct bnxt *bp,
 
                stats->tx_dropped += BNXT_GET_RING_STATS64(sw, tx_error_pkts);
 
-               stats->rx_dropped += cpr->sw_stats.rx.rx_netpoll_discards;
+               stats->rx_dropped +=
+                       cpr->sw_stats.rx.rx_netpoll_discards +
+                       cpr->sw_stats.rx.rx_oom_discards;
        }
 }
 

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index c8cdc77..dc96dd6 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -939,6 +939,7 @@ struct bnxt_rx_sw_stats {
        u64                     rx_l4_csum_errors;
        u64                     rx_resets;
        u64                     rx_buf_errors;
+       u64                     rx_oom_discards;
        u64                     rx_netpoll_discards;
 };