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bnx2x: organize BDs calculation for stop/resume

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Put the numbers used for stop/resume queue in a single place and
fix the condition for sanity check.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Kravkov 2012-06-25 22:32:50 +00:00 committed by David S. Miller
parent 16626b0cc3
commit 7df2dc6bd4
2 changed files with 22 additions and 4 deletions
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16
drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
View File

@ -614,6 +614,22 @@ struct bnx2x_fastpath {
#define TX_BD(x) ((x) & MAX_TX_BD)
#define TX_BD_POFF(x) ((x) & MAX_TX_DESC_CNT)
/* number of NEXT_PAGE descriptors may be required during placement */
#define NEXT_CNT_PER_TX_PKT(bds) \
(((bds) + MAX_TX_DESC_CNT - 1) / \
MAX_TX_DESC_CNT * NEXT_PAGE_TX_DESC_CNT)
/* max BDs per tx packet w/o next_pages:
* START_BD - describes packed
* START_BD(splitted) - includes unpaged data segment for GSO
* PARSING_BD - for TSO and CSUM data
* Frag BDs - decribes pages for frags
*/
#define BDS_PER_TX_PKT 3
#define MAX_BDS_PER_TX_PKT (MAX_SKB_FRAGS + BDS_PER_TX_PKT)
/* max BDs per tx packet including next pages */
#define MAX_DESC_PER_TX_PKT (MAX_BDS_PER_TX_PKT + \
NEXT_CNT_PER_TX_PKT(MAX_BDS_PER_TX_PKT))
/* The RX BD ring is special, each bd is 8 bytes but the last one is 16 */
#define NUM_RX_RINGS 8
#define RX_DESC_CNT (BCM_PAGE_SIZE / sizeof(struct eth_rx_bd))

10
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -221,7 +221,7 @@ int bnx2x_tx_int(struct bnx2x *bp, struct bnx2x_fp_txdata *txdata)
if ((netif_tx_queue_stopped(txq)) &&
(bp->state == BNX2X_STATE_OPEN) &&
(bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 4))
(bnx2x_tx_avail(bp, txdata) >= MAX_DESC_PER_TX_PKT))
netif_tx_wake_queue(txq);
__netif_tx_unlock(txq);
@ -2948,7 +2948,9 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
txdata->cid, fp_index, txdata_index, txdata, fp); */
if (unlikely(bnx2x_tx_avail(bp, txdata) <
(skb_shinfo(skb)->nr_frags + 3))) {
skb_shinfo(skb)->nr_frags +
BDS_PER_TX_PKT +
NEXT_CNT_PER_TX_PKT(MAX_BDS_PER_TX_PKT))) {
bnx2x_fp_qstats(bp, txdata->parent_fp)->driver_xoff++;
netif_tx_stop_queue(txq);
BNX2X_ERR("BUG! Tx ring full when queue awake!\n");
@ -3223,7 +3225,7 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
txdata->tx_bd_prod += nbd;
if (unlikely(bnx2x_tx_avail(bp, txdata) < MAX_SKB_FRAGS + 4)) {
if (unlikely(bnx2x_tx_avail(bp, txdata) < MAX_DESC_PER_TX_PKT)) {
netif_tx_stop_queue(txq);
/* paired memory barrier is in bnx2x_tx_int(), we have to keep
@ -3232,7 +3234,7 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
smp_mb();
bnx2x_fp_qstats(bp, txdata->parent_fp)->driver_xoff++;
if (bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 4)
if (bnx2x_tx_avail(bp, txdata) >= MAX_DESC_PER_TX_PKT)
netif_tx_wake_queue(txq);
}
txdata->tx_pkt++;