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be2net: Handle out of buffer completions for lancer

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If Lancer chip does not have posted RX buffers, it posts an RX completion entry
with the same frag_index as the last valid completion. The Error bit is also
set. In BE, a flush completion is indicated with a zero value for num_rcvd in
the completion.
Such completions don't carry any data and are not processed.
This patch refactors code to handle both cases with the same code.

Signed-off-by: Padmanabh Ratnakar <padmanabh.ratnakar@emulex.com>
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sathya Perla 2010-12-01 01:04:17 +00:00 committed by David S. Miller
parent 359a972fae
commit 6464281161
2 changed files with 38 additions and 21 deletions
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4
drivers/net/benet/be.h
View file

@ -220,7 +220,9 @@ struct be_rx_obj {
struct be_rx_stats stats;
u8 rss_id;
bool rx_post_starved; /* Zero rx frags have been posted to BE */
u32 cache_line_barrier[16];
u16 last_frag_index;
u16 rsvd;
u32 cache_line_barrier[15];
};
struct be_vf_cfg {

55
drivers/net/benet/be_main.c
View file

@ -911,11 +911,17 @@ static void be_rx_compl_discard(struct be_adapter *adapter,
rxq_idx = AMAP_GET_BITS(struct amap_eth_rx_compl, fragndx, rxcp);
num_rcvd = AMAP_GET_BITS(struct amap_eth_rx_compl, numfrags, rxcp);
for (i = 0; i < num_rcvd; i++) {
page_info = get_rx_page_info(adapter, rxo, rxq_idx);
put_page(page_info->page);
memset(page_info, 0, sizeof(*page_info));
index_inc(&rxq_idx, rxq->len);
/* Skip out-of-buffer compl(lancer) or flush compl(BE) */
if (likely(rxq_idx != rxo->last_frag_index && num_rcvd != 0)) {
rxo->last_frag_index = rxq_idx;
for (i = 0; i < num_rcvd; i++) {
page_info = get_rx_page_info(adapter, rxo, rxq_idx);
put_page(page_info->page);
memset(page_info, 0, sizeof(*page_info));
index_inc(&rxq_idx, rxq->len);
}
}
}
@ -1016,9 +1022,6 @@ static void be_rx_compl_process(struct be_adapter *adapter,
u8 vtm;
num_rcvd = AMAP_GET_BITS(struct amap_eth_rx_compl, numfrags, rxcp);
/* Is it a flush compl that has no data */
if (unlikely(num_rcvd == 0))
return;
skb = netdev_alloc_skb_ip_align(adapter->netdev, BE_HDR_LEN);
if (unlikely(!skb)) {
@ -1075,10 +1078,6 @@ static void be_rx_compl_process_gro(struct be_adapter *adapter,
u8 pkt_type;
num_rcvd = AMAP_GET_BITS(struct amap_eth_rx_compl, numfrags, rxcp);
/* Is it a flush compl that has no data */
if (unlikely(num_rcvd == 0))
return;
pkt_size = AMAP_GET_BITS(struct amap_eth_rx_compl, pktsize, rxcp);
vlanf = AMAP_GET_BITS(struct amap_eth_rx_compl, vtp, rxcp);
rxq_idx = AMAP_GET_BITS(struct amap_eth_rx_compl, fragndx, rxcp);
@ -1349,7 +1348,7 @@ static void be_rx_q_clean(struct be_adapter *adapter, struct be_rx_obj *rxo)
while ((rxcp = be_rx_compl_get(rxo)) != NULL) {
be_rx_compl_discard(adapter, rxo, rxcp);
be_rx_compl_reset(rxcp);
be_cq_notify(adapter, rx_cq->id, true, 1);
be_cq_notify(adapter, rx_cq->id, false, 1);
}
/* Then free posted rx buffer that were not used */
@ -1576,6 +1575,9 @@ static int be_rx_queues_create(struct be_adapter *adapter)
adapter->big_page_size = (1 << get_order(rx_frag_size)) * PAGE_SIZE;
for_all_rx_queues(adapter, rxo, i) {
rxo->adapter = adapter;
/* Init last_frag_index so that the frag index in the first
* completion will never match */
rxo->last_frag_index = 0xffff;
rxo->rx_eq.max_eqd = BE_MAX_EQD;
rxo->rx_eq.enable_aic = true;
@ -1697,10 +1699,9 @@ static irqreturn_t be_msix_tx_mcc(int irq, void *dev)
return IRQ_HANDLED;
}
static inline bool do_gro(struct be_adapter *adapter, struct be_rx_obj *rxo,
struct be_eth_rx_compl *rxcp)
static inline bool do_gro(struct be_rx_obj *rxo,
struct be_eth_rx_compl *rxcp, u8 err)
{
int err = AMAP_GET_BITS(struct amap_eth_rx_compl, err, rxcp);
int tcp_frame = AMAP_GET_BITS(struct amap_eth_rx_compl, tcpf, rxcp);
if (err)
@ -1717,6 +1718,8 @@ static int be_poll_rx(struct napi_struct *napi, int budget)
struct be_queue_info *rx_cq = &rxo->cq;
struct be_eth_rx_compl *rxcp;
u32 work_done;
u16 frag_index, num_rcvd;
u8 err;
rxo->stats.rx_polls++;
for (work_done = 0; work_done < budget; work_done++) {
@ -1724,10 +1727,22 @@ static int be_poll_rx(struct napi_struct *napi, int budget)
if (!rxcp)
break;
if (do_gro(adapter, rxo, rxcp))
be_rx_compl_process_gro(adapter, rxo, rxcp);
else
be_rx_compl_process(adapter, rxo, rxcp);
err = AMAP_GET_BITS(struct amap_eth_rx_compl, err, rxcp);
frag_index = AMAP_GET_BITS(struct amap_eth_rx_compl, fragndx,
rxcp);
num_rcvd = AMAP_GET_BITS(struct amap_eth_rx_compl, numfrags,
rxcp);
/* Skip out-of-buffer compl(lancer) or flush compl(BE) */
if (likely(frag_index != rxo->last_frag_index &&
num_rcvd != 0)) {
rxo->last_frag_index = frag_index;
if (do_gro(rxo, rxcp, err))
be_rx_compl_process_gro(adapter, rxo, rxcp);
else
be_rx_compl_process(adapter, rxo, rxcp);
}
be_rx_compl_reset(rxcp);
}