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alx: fix alx_poll() 

[ Upstream commit 7a05dc64e2e4c611d89007b125b20c0d2a4d31a5 ]

Commit d75b1ade567f ("net: less interrupt masking in NAPI") uncovered
wrong alx_poll() behavior.

A NAPI poll() handler is supposed to return exactly the budget when/if
napi_complete() has not been called.

It is also supposed to return number of frames that were received, so
that netdev_budget can have a meaning.

Also, in case of TX pressure, we still have to dequeue received
packets : alx_clean_rx_irq() has to be called even if
alx_clean_tx_irq(alx) returns false, otherwise device is half duplex.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: d75b1ade567f ("net: less interrupt masking in NAPI")
Reported-by: Oded Gabbay <oded.gabbay@amd.com>
Bisected-by: Oded Gabbay <oded.gabbay@amd.com>
Tested-by: Oded Gabbay <oded.gabbay@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2015-01-11 10:32:18 -08:00 committed by Greg Kroah-Hartman
parent afd67b681c
commit 416b16c110
1 changed files with 13 additions and 11 deletions
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24
drivers/net/ethernet/atheros/alx/main.c
View File

@ -184,15 +184,16 @@ static void alx_schedule_reset(struct alx_priv *alx)
schedule_work(&alx->reset_wk);
}
static bool alx_clean_rx_irq(struct alx_priv *alx, int budget)
static int alx_clean_rx_irq(struct alx_priv *alx, int budget)
{
struct alx_rx_queue *rxq = &alx->rxq;
struct alx_rrd *rrd;
struct alx_buffer *rxb;
struct sk_buff *skb;
u16 length, rfd_cleaned = 0;
int work = 0;
while (budget > 0) {
while (work < budget) {
rrd = &rxq->rrd[rxq->rrd_read_idx];
if (!(rrd->word3 & cpu_to_le32(1 << RRD_UPDATED_SHIFT)))
break;
@ -203,7 +204,7 @@ static bool alx_clean_rx_irq(struct alx_priv *alx, int budget)
ALX_GET_FIELD(le32_to_cpu(rrd->word0),
RRD_NOR) != 1) {
alx_schedule_reset(alx);
return 0;
return work;
}
rxb = &rxq->bufs[rxq->read_idx];
@ -243,7 +244,7 @@ static bool alx_clean_rx_irq(struct alx_priv *alx, int budget)
}
napi_gro_receive(&alx->napi, skb);
budget--;
work++;
next_pkt:
if (++rxq->read_idx == alx->rx_ringsz)
@ -258,21 +259,22 @@ next_pkt:
if (rfd_cleaned)
alx_refill_rx_ring(alx, GFP_ATOMIC);
return budget > 0;
return work;
}
static int alx_poll(struct napi_struct *napi, int budget)
{
struct alx_priv *alx = container_of(napi, struct alx_priv, napi);
struct alx_hw *hw = &alx->hw;
bool complete = true;
unsigned long flags;
bool tx_complete;
int work;
complete = alx_clean_tx_irq(alx) &&
alx_clean_rx_irq(alx, budget);
tx_complete = alx_clean_tx_irq(alx);
work = alx_clean_rx_irq(alx, budget);
if (!complete)
return 1;
if (!tx_complete || work == budget)
return budget;
napi_complete(&alx->napi);
@ -284,7 +286,7 @@ static int alx_poll(struct napi_struct *napi, int budget)
alx_post_write(hw);
return 0;
return work;
}
static irqreturn_t alx_intr_handle(struct alx_priv *alx, u32 intr)