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net: fec: implement TSO descriptor cleanup

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[ Upstream commit 61dc1fd9205bc9d9918aa933a847b08e80b4dc20 ]

Implement cleanup of descriptors in the TSO error path of
fec_enet_txq_submit_tso(). The cleanup

- Unmaps DMA buffers for data descriptors skipping TSO header
- Clears all buffer descriptors
- Handles extended descriptors by clearing cbd_esc when enabled

Fixes: 79f339125e ("net: fec: Add software TSO support")
Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@gmail.com>
Reviewed-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20250120085430.99318-1-dheeraj.linuxdev@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dheeraj Reddy Jonnalagadda 2025-01-20 14:24:30 +05:30 • committed by Greg Kroah-Hartman
commit 6ffa190852
1 changed files with 30 additions and 1 deletions
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31
drivers/net/ethernet/freescale/fec_main.c
View file

@ -732,6 +732,8 @@ static int fec_enet_txq_submit_tso(struct fec_enet_priv_tx_q *txq,
int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
int total_len, data_left;
struct bufdesc *bdp = txq->bd.cur;
struct bufdesc *tmp_bdp;
struct bufdesc_ex *ebdp;
struct tso_t tso;
unsigned int index = 0;
int ret;
@ -805,7 +807,34 @@ static int fec_enet_txq_submit_tso(struct fec_enet_priv_tx_q *txq,
return 0;
err_release:
/* TODO: Release all used data descriptors for TSO */
/* Release all used data descriptors for TSO */
tmp_bdp = txq->bd.cur;
while (tmp_bdp != bdp) {
/* Unmap data buffers */
if (tmp_bdp->cbd_bufaddr &&
!IS_TSO_HEADER(txq, fec32_to_cpu(tmp_bdp->cbd_bufaddr)))
dma_unmap_single(&fep->pdev->dev,
fec32_to_cpu(tmp_bdp->cbd_bufaddr),
fec16_to_cpu(tmp_bdp->cbd_datlen),
DMA_TO_DEVICE);
/* Clear standard buffer descriptor fields */
tmp_bdp->cbd_sc = 0;
tmp_bdp->cbd_datlen = 0;
tmp_bdp->cbd_bufaddr = 0;
/* Handle extended descriptor if enabled */
if (fep->bufdesc_ex) {
ebdp = (struct bufdesc_ex *)tmp_bdp;
ebdp->cbd_esc = 0;
}
tmp_bdp = fec_enet_get_nextdesc(tmp_bdp, &txq->bd);
}
dev_kfree_skb_any(skb);
return ret;
}