4.14-stable review patch. If anyone has any objections, please let me know.
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From: Madalin Bucur madalin.bucur@nxp.com
[ Upstream commit 120d75ecf043044554abbba8507f6d22e4715beb ]
An issue in the code mapping the skb fragments into scatter-gather frames was evidentiated by netperf TCP_SENDFILE tests. The size was set wrong for all fragments but the first, affecting the transmission of any skb with more than one fragment.
Signed-off-by: Madalin Bucur madalin.bucur@nxp.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-)
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -1930,8 +1930,10 @@ static int skb_to_sg_fd(struct dpaa_priv goto csum_failed; }
+ /* SGT[0] is used by the linear part */ sgt = (struct qm_sg_entry *)(sgt_buf + priv->tx_headroom); - qm_sg_entry_set_len(&sgt[0], skb_headlen(skb)); + frag_len = skb_headlen(skb); + qm_sg_entry_set_len(&sgt[0], frag_len); sgt[0].bpid = FSL_DPAA_BPID_INV; sgt[0].offset = 0; addr = dma_map_single(dev, skb->data, @@ -1944,9 +1946,9 @@ static int skb_to_sg_fd(struct dpaa_priv qm_sg_entry_set64(&sgt[0], addr);
/* populate the rest of SGT entries */ - frag = &skb_shinfo(skb)->frags[0]; - frag_len = frag->size; - for (i = 1; i <= nr_frags; i++, frag++) { + for (i = 0; i < nr_frags; i++) { + frag = &skb_shinfo(skb)->frags[i]; + frag_len = frag->size; WARN_ON(!skb_frag_page(frag)); addr = skb_frag_dma_map(dev, frag, 0, frag_len, dma_dir); @@ -1956,15 +1958,16 @@ static int skb_to_sg_fd(struct dpaa_priv goto sg_map_failed; }
- qm_sg_entry_set_len(&sgt[i], frag_len); - sgt[i].bpid = FSL_DPAA_BPID_INV; - sgt[i].offset = 0; + qm_sg_entry_set_len(&sgt[i + 1], frag_len); + sgt[i + 1].bpid = FSL_DPAA_BPID_INV; + sgt[i + 1].offset = 0;
/* keep the offset in the address */ - qm_sg_entry_set64(&sgt[i], addr); - frag_len = frag->size; + qm_sg_entry_set64(&sgt[i + 1], addr); } - qm_sg_entry_set_f(&sgt[i - 1], frag_len); + + /* Set the final bit in the last used entry of the SGT */ + qm_sg_entry_set_f(&sgt[nr_frags], frag_len);
qm_fd_set_sg(fd, priv->tx_headroom, skb->len);