| Message ID | 20230508142931.980196-1-shenwei.wang@nxp.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v4,1/1] net: fec: correct the counting of XDP sent frames | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Guessing tree name failed - patch did not apply |
On Mon, May 08, 2023 at 09:29:31AM -0500, Shenwei Wang wrote: > In the current xdp_xmit implementation, if any single frame fails to > transmit due to insufficient buffer descriptors, the function nevertheless > reports success in sending all frames. This results in erroneously > indicating that frames were transmitted when in fact they were dropped. > > This patch fixes the issue by ensureing the return value properly > indicates the actual number of frames successfully transmitted, rather than > potentially reporting success for all frames when some could not transmit. > > Fixes: 6d6b39f180b8 ("net: fec: add initial XDP support") > Signed-off-by: Gagandeep Singh <g.singh@nxp.com> > Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com> > --- > v4: > - the tx frame shouldn't be returned when error occurs. > - changed the function return values by using the standard errno. > > v3: > - resend the v2 fix for "net" as the standalone patch. > > v2: > - only keep the bug fix part of codes according to Horatiu's comments. > - restructure the functions to avoid the forward declaration. > > drivers/net/ethernet/freescale/fec_main.c | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) <...> > - for (i = 0; i < num_frames; i++) > - fec_enet_txq_xmit_frame(fep, txq, frames[i]); > + for (i = 0; i < num_frames; i++) { > + if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) != 0) > + break; > + sent_frames++; > + } net-next has commit 6312c685ae0 ("net: fec: correct the counting of XDP sent frames") which has exactly these lines. Plus the patch is missing target tree in its subject line. For example: [PATCH net-next] ... Thanks
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 160c1b3525f5..36a3ee304482 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -3798,7 +3798,7 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep, entries_free = fec_enet_get_free_txdesc_num(txq); if (entries_free < MAX_SKB_FRAGS + 1) { netdev_err(fep->netdev, "NOT enough BD for SG!\n"); - return NETDEV_TX_OK; + return -EBUSY; } /* Fill in a Tx ring entry */ @@ -3812,7 +3812,7 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep, dma_addr = dma_map_single(&fep->pdev->dev, frame->data, frame->len, DMA_TO_DEVICE); if (dma_mapping_error(&fep->pdev->dev, dma_addr)) - return FEC_ENET_XDP_CONSUMED; + return -ENOMEM; status |= (BD_ENET_TX_INTR | BD_ENET_TX_LAST); if (fep->bufdesc_ex) @@ -3856,6 +3856,7 @@ static int fec_enet_xdp_xmit(struct net_device *dev, struct fec_enet_private *fep = netdev_priv(dev); struct fec_enet_priv_tx_q *txq; int cpu = smp_processor_id(); + unsigned int sent_frames = 0; struct netdev_queue *nq; unsigned int queue; int i; @@ -3866,8 +3867,11 @@ static int fec_enet_xdp_xmit(struct net_device *dev, __netif_tx_lock(nq, cpu); - for (i = 0; i < num_frames; i++) - fec_enet_txq_xmit_frame(fep, txq, frames[i]); + for (i = 0; i < num_frames; i++) { + if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) != 0) + break; + sent_frames++; + } /* Make sure the update to bdp and tx_skbuff are performed. */ wmb(); @@ -3877,7 +3881,7 @@ static int fec_enet_xdp_xmit(struct net_device *dev, __netif_tx_unlock(nq); - return num_frames; + return sent_frames; } static const struct net_device_ops fec_netdev_ops = {
In the current xdp_xmit implementation, if any single frame fails to transmit due to insufficient buffer descriptors, the function nevertheless reports success in sending all frames. This results in erroneously indicating that frames were transmitted when in fact they were dropped. This patch fixes the issue by ensureing the return value properly indicates the actual number of frames successfully transmitted, rather than potentially reporting success for all frames when some could not transmit. Fixes: 6d6b39f180b8 ("net: fec: add initial XDP support") Signed-off-by: Gagandeep Singh <g.singh@nxp.com> Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com> --- v4: - the tx frame shouldn't be returned when error occurs. - changed the function return values by using the standard errno. v3: - resend the v2 fix for "net" as the standalone patch. v2: - only keep the bug fix part of codes according to Horatiu's comments. - restructure the functions to avoid the forward declaration. drivers/net/ethernet/freescale/fec_main.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) -- 2.34.1