netdev - [PATCH v2 net-next 08/16] sfc: don't call tx_limit

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Message-ID: <6b18eefb-aa36-1ef1-ffc1-3278ac804c26@solarflare.com>
Date:   Thu, 2 Jul 2020 17:30:23 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 08/16] sfc: don't call tx_limit_len if NIC type
 doesn't have one

EF100 doesn't need to split up large DMAs.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/tx_common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/tx_common.c b/drivers/net/ethernet/sfc/tx_common.c
index 2a058b76d1f0..11b64c609550 100644
--- a/drivers/net/ethernet/sfc/tx_common.c
+++ b/drivers/net/ethernet/sfc/tx_common.c
@@ -298,7 +298,11 @@ struct efx_tx_buffer *efx_tx_map_chunk(struct efx_tx_queue *tx_queue,
 	/* Map the fragment taking account of NIC-dependent DMA limits. */
 	do {
 		buffer = efx_tx_queue_get_insert_buffer(tx_queue);
-		dma_len = nic_type->tx_limit_len(tx_queue, dma_addr, len);
+
+		if (nic_type->tx_limit_len)
+			dma_len = nic_type->tx_limit_len(tx_queue, dma_addr, len);
+		else
+			dma_len = len;
 
 		buffer->len = dma_len;
 		buffer->dma_addr = dma_addr;