Commit e638ee1d authored by Edward Cree's avatar Edward Cree Committed by David S. Miller
Browse files

sfc: handle failure to allocate TSOv2 contexts 



If we fail to init the TXQ because of insufficient TSOv2 contexts,
try again with TSOv2 disabled.

Signed-off-by: default avatarEdward Cree <ecree@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e9117e50

drivers/net/ethernet/sfc/ef10.c

+24 −16
Original line number Diff line number Diff line
@@ -2178,9 +2178,6 @@ static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue) 
	/* TSOv2 is a limited resource that can only be configured on a limited

	 * number of queues. TSO without checksum offload is not really a thing,

	 * so we only enable it for those queues.

	 *

	 * TODO: handle failure to allocate this in the case where we've used

	 * all the queues.

	 */

	if (csum_offload && (nic_data->datapath_caps2 &

			(1 << MC_CMD_GET_CAPABILITIES_V2_OUT_TX_TSO_V2_LBN))) {
@@ -2193,15 +2190,6 @@ static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue) 
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_TARGET_EVQ, channel->channel);

	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->queue);

	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_INSTANCE, tx_queue->queue);

	MCDI_POPULATE_DWORD_3(inbuf, INIT_TXQ_IN_FLAGS,

			      /* This flag was removed from mcdi_pcol.h for

			       * the non-_EXT version of INIT_TXQ.  However,

			       * firmware still honours it.

			       */

			      INIT_TXQ_EXT_IN_FLAG_TSOV2_EN, tso_v2,

			      INIT_TXQ_IN_FLAG_IP_CSUM_DIS, !csum_offload,

			      INIT_TXQ_IN_FLAG_TCP_CSUM_DIS, !csum_offload);



	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_OWNER_ID, 0);

	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_PORT_ID, nic_data->vport_id);
@@ -2217,10 +2205,30 @@ static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue) 


	inlen = MC_CMD_INIT_TXQ_IN_LEN(entries);



	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_TXQ, inbuf, inlen,

	do {

		MCDI_POPULATE_DWORD_3(inbuf, INIT_TXQ_IN_FLAGS,

				/* This flag was removed from mcdi_pcol.h for

				 * the non-_EXT version of INIT_TXQ.  However,

				 * firmware still honours it.

				 */

				INIT_TXQ_EXT_IN_FLAG_TSOV2_EN, tso_v2,

				INIT_TXQ_IN_FLAG_IP_CSUM_DIS, !csum_offload,

				INIT_TXQ_IN_FLAG_TCP_CSUM_DIS, !csum_offload);



		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_INIT_TXQ, inbuf, inlen,

					NULL, 0, NULL);

	if (rc)

		if (rc == -ENOSPC && tso_v2) {

			/* Retry without TSOv2 if we're short on contexts. */

			tso_v2 = false;

			netif_warn(efx, probe, efx->net_dev,

				   "TSOv2 context not available to segment in hardware. TCP performance may be reduced.\n");

		} else if (rc) {

			efx_mcdi_display_error(efx, MC_CMD_INIT_TXQ,

					       MC_CMD_INIT_TXQ_EXT_IN_LEN,

					       NULL, 0, rc);

			goto fail;

		}

	} while (rc);



	/* A previous user of this TX queue might have set us up the

	 * bomb by writing a descriptor to the TX push collector but