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net/sfc: restart TxQ in case of exception on event queue

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Examples of recoverable exceptions because of Tx error are:
 - Tx descriptor PCI read error
 - invalid Tx option descriptor
 - Tx option descriptor not supported by the firmware variant
 - unexpected Tx option descriptor (e.g. missing FATSO2A before
   FATSO2B, missing FATSO2B after FATSO2A)
 - incomplete packet push (CONT bit set in the latest pushed DMA
   descriptor)

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andrew Lee <alee@solarflare.com>
Reviewed-by: Robert Stonehouse <rstonehouse@solarflare.com>
This commit is contained in:
Ivan Malov 2016-12-02 07:41:21 +00:00 committed by Ferruh Yigit
parent 77f2d0534d
commit 4a18304d24
1 changed files with 14 additions and 0 deletions
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14
drivers/net/sfc/sfc_ev.c
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@ -339,6 +339,20 @@ sfc_ev_qpoll(struct sfc_evq *evq)
rxq_sw_index);
}
if (evq->txq != NULL) {
unsigned int txq_sw_index = sfc_txq_sw_index(evq->txq);
sfc_warn(sa,
"restart TxQ %u because of exception on its EvQ %u",
txq_sw_index, evq->evq_index);
sfc_tx_qstop(sa, txq_sw_index);
rc = sfc_tx_qstart(sa, txq_sw_index);
if (rc != 0)
sfc_err(sa, "cannot restart TxQ %u",
txq_sw_index);
}
if (evq->exception)
sfc_panic(sa, "unrecoverable exception on EvQ %u",
evq->evq_index);