From 4c69c77aafe74cf755af55070584b643e5c4e4d8 Mon Sep 17 00:00:00 2001 From: Joshua Hay Date: Mon, 7 Oct 2024 13:24:35 -0700 Subject: idpf: set completion tag for "empty" bufs associated with a packet Commit d9028db618a6 ("idpf: convert to libeth Tx buffer completion") inadvertently removed code that was necessary for the tx buffer cleaning routine to iterate over all buffers associated with a packet. When a frag is too large for a single data descriptor, it will be split across multiple data descriptors. This means the frag will span multiple buffers in the buffer ring in order to keep the descriptor and buffer ring indexes aligned. The buffer entries in the ring are technically empty and no cleaning actions need to be performed. These empty buffers can precede other frags associated with the same packet. I.e. a single packet on the buffer ring can look like: buf[0]=skb0.frag0 buf[1]=skb0.frag1 buf[2]=empty buf[3]=skb0.frag2 The cleaning routine iterates through these buffers based on a matching completion tag. If the completion tag is not set for buf2, the loop will end prematurely. Frag2 will be left uncleaned and next_to_clean will be left pointing to the end of packet, which will break the cleaning logic for subsequent cleans. This consequently leads to tx timeouts. Assign the empty bufs the same completion tag for the packet to ensure the cleaning routine iterates over all of the buffers associated with the packet. Fixes: d9028db618a6 ("idpf: convert to libeth Tx buffer completion") Signed-off-by: Joshua Hay Acked-by: Alexander Lobakin Reviewed-by: Madhu chittim Reviewed-by: Simon Horman Tested-by: Krishneil Singh Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index da2a5becf62f..34f4118c7bc0 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -2448,6 +2448,7 @@ static void idpf_tx_splitq_map(struct idpf_tx_queue *tx_q, * rest of the packet. */ tx_buf->type = LIBETH_SQE_EMPTY; + idpf_tx_buf_compl_tag(tx_buf) = params->compl_tag; /* Adjust the DMA offset and the remaining size of the * fragment. On the first iteration of this loop, -- cgit v1.2.3-70-g09d2