From: Ivan Malov <ivan.malov@oktetlabs.ru>
Date: Fri, 2 Dec 2016 07:41:21 +0000 (+0000)
Subject: net/sfc: restart TxQ in case of exception on event queue
X-Git-Tag: spdx-start~5042
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=4a18304d24c0939cbf552519428beb31053c6a05;p=dpdk.git

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

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>
---

diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
index 36aede811c..af3c7b2813 100644
--- a/drivers/net/sfc/sfc_ev.c
+++ b/drivers/net/sfc/sfc_ev.c
@@ -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);