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| author |   Eric Dumazet <edumazet@google.com> | 2022-02-07 16:48:55 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-02-08 16:51:23 -0800 |
| commit | 99f5a5f2b94840032e85f7616ef13301a962b96a (patch) | |
| tree | 4e6f96906db8052a90c1492a937fd705958f292b /drivers/net/ethernet/agere/et131x.c | |
| parent | Merge branch 'iwl-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/linux (diff) | |
| download | linux-99f5a5f2b94840032e85f7616ef13301a962b96a.tar.xz linux-99f5a5f2b94840032e85f7616ef13301a962b96a.zip | |
et131x: support arbitrary MAX_SKB_FRAGS
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>
Link: https://lore.kernel.org/r/20220208004855.1887345-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/agere/et131x.c')
| -rw-r--r-- | drivers/net/ethernet/agere/et131x.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/net/ethernet/agere/et131x.c b/drivers/net/ethernet/agere/et131x.c index 537e6a85e18d..fbf4588994ac 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); |