[PATCH net-next] et131x: support arbitrary MAX_SKB_FRAGS
From: Eric Dumazet <hidden>
Date: 2022-02-08 01:13:22
Subsystem:
et131x network driver, networking drivers, the rest · Maintainers:
Mark Einon, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Eric Dumazet <edumazet@google.com> This NIC does not support TSO, it is very unlikely it would have to send packets with many fragments. Signed-off-by: Eric Dumazet <edumazet@google.com> --- drivers/net/ethernet/agere/et131x.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/agere/et131x.c b/drivers/net/ethernet/agere/et131x.c
index 537e6a85e18da7f42bb6ff6d4efe3dbdaf0248d4..fbf4588994ac55c5799bf7c375368144fba8d46a 100644
--- a/drivers/net/ethernet/agere/et131x.c
+++ b/drivers/net/ethernet/agere/et131x.c@@ -2413,11 +2413,13 @@ static void et131x_tx_dma_memory_free(struct et131x_adapter *adapter) kfree(tx_ring->tcb_ring); } +#define MAX_TX_DESC_PER_PKT 24 + /* nic_send_packet - NIC specific send handler for version B silicon. */ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb) { u32 i; - struct tx_desc desc[24]; + struct tx_desc desc[MAX_TX_DESC_PER_PKT]; u32 frag = 0; u32 thiscopy, remainder; struct sk_buff *skb = tcb->skb;
@@ -2432,9 +2434,6 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb) * more than 5 fragments. */ - /* nr_frags should be no more than 18. */ - BUILD_BUG_ON(MAX_SKB_FRAGS + 1 > 23); - memset(desc, 0, sizeof(struct tx_desc) * (nr_frags + 1)); for (i = 0; i < nr_frags; i++) {
@@ -3762,6 +3761,13 @@ static netdev_tx_t et131x_tx(struct sk_buff *skb, struct net_device *netdev) struct et131x_adapter *adapter = netdev_priv(netdev); struct tx_ring *tx_ring = &adapter->tx_ring; + /* This driver does not support TSO, it is very unlikely + * this condition is true. + */ + if (unlikely(skb_shinfo(skb)->nr_frags > MAX_TX_DESC_PER_PKT - 2)) { + if (skb_linearize(skb)) + goto drop_err; + } /* stop the queue if it's getting full */ if (tx_ring->used >= NUM_TCB - 1 && !netif_queue_stopped(netdev)) netif_stop_queue(netdev);
--
2.35.0.263.gb82422642f-goog