| Message ID | 20250109224246.1866690-1-sean.anderson@linux.dev (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [net,v3] net: xilinx: axienet: Fix IRQ coalescing packet count overflow | expand |
On 1/9/25 17:42, Sean Anderson wrote: > If coalece_count is greater than 255 it will not fit in the register and > will overflow. This can be reproduced by running > > # ethtool -C ethX rx-frames 256 > > which will result in a timeout of 0us instead. Fix this by checking for > invalid values and reporting an error. > > Signed-off-by: Sean Anderson <sean.anderson@linux.dev> > Fixes: 8a3b7a252dca ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") > --- > > Changes in v3: > - Validate and reject instead of silently clamping > > Changes in v2: > - Use FIELD_MAX to extract the max value from the mask > - Expand the commit message with an example on how to reproduce this > issue > > drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c > index 0f4b02fe6f85..c2991aeccf2b 100644 > --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c > +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c > @@ -2056,6 +2056,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev, > return -EBUSY; > } > > + if (ecoalesce->rx_max_coalesced_frames > 255 || > + ecoalesce->rx_max_coalesced_frames > 255) { The second line should be for tx and not rx. Will resend tomorrow if no other feedback. --Sean > + NL_SET_ERR_MSG(extack, "frames must be less than 256"); > + return -EINVAL; > + } > + > if (ecoalesce->rx_max_coalesced_frames) > lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames; > if (ecoalesce->rx_coalesce_usecs)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 0f4b02fe6f85..c2991aeccf2b 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -2056,6 +2056,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev, return -EBUSY; } + if (ecoalesce->rx_max_coalesced_frames > 255 || + ecoalesce->rx_max_coalesced_frames > 255) { + NL_SET_ERR_MSG(extack, "frames must be less than 256"); + return -EINVAL; + } + if (ecoalesce->rx_max_coalesced_frames) lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames; if (ecoalesce->rx_coalesce_usecs)
If coalece_count is greater than 255 it will not fit in the register and will overflow. This can be reproduced by running # ethtool -C ethX rx-frames 256 which will result in a timeout of 0us instead. Fix this by checking for invalid values and reporting an error. Signed-off-by: Sean Anderson <sean.anderson@linux.dev> Fixes: 8a3b7a252dca ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") --- Changes in v3: - Validate and reject instead of silently clamping Changes in v2: - Use FIELD_MAX to extract the max value from the mask - Expand the commit message with an example on how to reproduce this issue drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++++++ 1 file changed, 6 insertions(+)