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RDMA/rxe: Fix incorrect rxe_put in error path

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In rxe_send() a ref is taken on the qp to keep it alive until the
kfree_skb() has a chance to call the skb destructor rxe_skb_tx_dtor()
which drops the reference. If the packet has an incorrect protocol the
error path just calls kfree_skb() which will call the destructor which
will drop the ref. Currently the driver also calls rxe_put() which is
incorrect. Additionally since the packets sent to rxe_send() are under the
control of the driver and it only ever produces IPV4 or IPV6 packets the
simplest fix is to remove all the code in this block.

Link: https://lore.kernel.org/r/20240329145513.35381-12-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Fixes: 9eb7f8e44d ("IB/rxe: Move refcounting earlier in rxe_send()")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bob Pearson 2024-03-29 09:55:12 -05:00 committed by Jason Gunthorpe
parent 23bc06af54
commit 8776618dbb
1 changed files with 2 additions and 10 deletions
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12
drivers/infiniband/sw/rxe/rxe_net.c
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@ -366,18 +366,10 @@ static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
rxe_get(pkt->qp);
atomic_inc(&pkt->qp->skb_out);
if (skb->protocol == htons(ETH_P_IP)) {
if (skb->protocol == htons(ETH_P_IP))
err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
} else if (skb->protocol == htons(ETH_P_IPV6)) {
else
err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
} else {
rxe_dbg_qp(pkt->qp, "Unknown layer 3 protocol: %d\n",
skb->protocol);
atomic_dec(&pkt->qp->skb_out);
rxe_put(pkt->qp);
kfree_skb(skb);
return -EINVAL;
}
if (unlikely(net_xmit_eval(err))) {
rxe_dbg_qp(pkt->qp, "error sending packet: %d\n", err);