5.4-stable review patch. If anyone has any objections, please let me know.
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From: Dheeraj Reddy Jonnalagadda dheeraj.linuxdev@gmail.com
[ 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: 79f339125ea3 ("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 --- drivers/net/ethernet/freescale/fec_main.c | 31 ++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index f11824a078e9e..5660a83356eb0 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -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; }