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bnx2x: Filter packets on FCoE rings 

Whenever bnx2x fails to transmit a packet due to a full Tx ring, if the
ring size is zero (indicating an FCoE ring) driver filters the packet out
and gracefully continues.
Driver also gathers statistics on such filtered packets.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Kravkov 2012-12-02 04:05:48 +00:00 committed by David S. Miller
parent 4c70489932
commit c96bdc0c9e
4 changed files with 17 additions and 4 deletions
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11
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -3127,11 +3127,16 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
BDS_PER_TX_PKT +
NEXT_CNT_PER_TX_PKT(MAX_BDS_PER_TX_PKT))) {
/* Handle special storage cases separately */
if (txdata->tx_ring_size != 0) {
BNX2X_ERR("BUG! Tx ring full when queue awake!\n");
if (txdata->tx_ring_size == 0) {
struct bnx2x_eth_q_stats *q_stats =
bnx2x_fp_qstats(bp, txdata->parent_fp);
q_stats->driver_filtered_tx_pkt++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
bnx2x_fp_qstats(bp, txdata->parent_fp)->driver_xoff++;
netif_tx_stop_queue(txq);
}
BNX2X_ERR("BUG! Tx ring full when queue awake!\n");
return NETDEV_TX_BUSY;
}

6
drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
View File

@ -62,7 +62,9 @@ static const struct {
8, "[%s]: tpa_aggregations" },
{ Q_STATS_OFFSET32(total_tpa_aggregated_frames_hi),
8, "[%s]: tpa_aggregated_frames"},
{ Q_STATS_OFFSET32(total_tpa_bytes_hi), 8, "[%s]: tpa_bytes"}
{ Q_STATS_OFFSET32(total_tpa_bytes_hi), 8, "[%s]: tpa_bytes"},
{ Q_STATS_OFFSET32(driver_filtered_tx_pkt),
4, "[%s]: driver_filtered_tx_pkt" }
};
#define BNX2X_NUM_Q_STATS ARRAY_SIZE(bnx2x_q_stats_arr)
@ -177,6 +179,8 @@ static const struct {
4, STATS_FLAGS_FUNC, "recoverable_errors" },
{ STATS_OFFSET32(unrecoverable_error),
4, STATS_FLAGS_FUNC, "unrecoverable_errors" },
{ STATS_OFFSET32(driver_filtered_tx_pkt),
4, STATS_FLAGS_FUNC, "driver_filtered_tx_pkt" },
{ STATS_OFFSET32(eee_tx_lpi),
4, STATS_FLAGS_PORT, "Tx LPI entry count"}
};

1
drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
View File

@ -1149,6 +1149,7 @@ static void bnx2x_drv_stats_update(struct bnx2x *bp)
UPDATE_ESTAT_QSTAT(rx_err_discard_pkt);
UPDATE_ESTAT_QSTAT(rx_skb_alloc_failed);
UPDATE_ESTAT_QSTAT(hw_csum_err);
UPDATE_ESTAT_QSTAT(driver_filtered_tx_pkt);
}
}

3
drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h
View File

@ -203,6 +203,7 @@ struct bnx2x_eth_stats {
/* Recovery */
u32 recoverable_error;
u32 unrecoverable_error;
u32 driver_filtered_tx_pkt;
/* src: Clear-on-Read register; Will not survive PMF Migration */
u32 eee_tx_lpi;
};
@ -264,6 +265,7 @@ struct bnx2x_eth_q_stats {
u32 total_tpa_aggregated_frames_lo;
u32 total_tpa_bytes_hi;
u32 total_tpa_bytes_lo;
u32 driver_filtered_tx_pkt;
};
struct bnx2x_eth_stats_old {
@ -315,6 +317,7 @@ struct bnx2x_eth_q_stats_old {
u32 rx_err_discard_pkt_old;
u32 rx_skb_alloc_failed_old;
u32 hw_csum_err_old;
u32 driver_filtered_tx_pkt_old;
};
struct bnx2x_net_stats_old {