| Message ID | 1347577184-8417-1-git-send-email-mschmidt@redhat.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
On Fri, 2012-09-14 at 00:59 +0200, Michal Schmidt wrote: > Commit d6cb3e41 "bnx2x: fix checksum validation" caused a performance > regression for IPv6. Rx checksum offload does not work. IPv6 packets > are passed to the stack with CHECKSUM_NONE. > > The hardware obviously cannot perform IP checksum validation for IPv6, > because there is no checksum in the IPv6 header. This should not prevent > us from setting CHECKSUM_UNNECESSARY. > > Tested on BCM57711. > > Signed-off-by: Michal Schmidt <mschmidt@redhat.com> > --- > drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > index af20c6e..e8e97a7 100644 > --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > @@ -662,14 +662,16 @@ void bnx2x_csum_validate(struct sk_buff *skb, union eth_rx_cqe *cqe, > struct bnx2x_fastpath *fp, > struct bnx2x_eth_q_stats *qstats) > { > - /* Do nothing if no IP/L4 csum validation was done */ > - > + /* Do nothing if no L4 csum validation was done. > + * We do not check whether IP csum was validated. For IPv4 we assume > + * that if the card got as far as validating the L4 csum, it also > + * validated the IP csum. IPv6 has no IP csum. > + */ > if (cqe->fast_path_cqe.status_flags & > - (ETH_FAST_PATH_RX_CQE_IP_XSUM_NO_VALIDATION_FLG | > - ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG)) > + ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG) > return; > > - /* If both IP/L4 validation were done, check if an error was found. */ > + /* If L4 validation was done, check if an error was found. */ > > if (cqe->fast_path_cqe.type_error_flags & > (ETH_FAST_PATH_RX_CQE_IP_BAD_XSUM_FLG | Thanks for fixing this bug ! Acked-by: Eric Dumazet <edumazet@google.com> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 2012-09-14 at 01:14 +0200, Eric Dumazet wrote: > On Fri, 2012-09-14 at 00:59 +0200, Michal Schmidt wrote: > > Commit d6cb3e41 "bnx2x: fix checksum validation" caused a performance > > regression for IPv6. Rx checksum offload does not work. IPv6 packets > > are passed to the stack with CHECKSUM_NONE. > > > > The hardware obviously cannot perform IP checksum validation for IPv6, > > because there is no checksum in the IPv6 header. This should not prevent > > us from setting CHECKSUM_UNNECESSARY. > > > > Tested on BCM57711. > > > > Signed-off-by: Michal Schmidt <mschmidt@redhat.com> > > --- > > drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 12 +++++++----- > > 1 file changed, 7 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > index af20c6e..e8e97a7 100644 > > --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > @@ -662,14 +662,16 @@ void bnx2x_csum_validate(struct sk_buff *skb, union eth_rx_cqe *cqe, > > struct bnx2x_fastpath *fp, > > struct bnx2x_eth_q_stats *qstats) > > { > > - /* Do nothing if no IP/L4 csum validation was done */ > > - > > + /* Do nothing if no L4 csum validation was done. > > + * We do not check whether IP csum was validated. For IPv4 we assume > > + * that if the card got as far as validating the L4 csum, it also > > + * validated the IP csum. IPv6 has no IP csum. > > + */ > > if (cqe->fast_path_cqe.status_flags & > > - (ETH_FAST_PATH_RX_CQE_IP_XSUM_NO_VALIDATION_FLG | > > - ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG)) > > + ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG) > > return; > > > > - /* If both IP/L4 validation were done, check if an error was found. */ > > + /* If L4 validation was done, check if an error was found. */ > > > > if (cqe->fast_path_cqe.type_error_flags & > > (ETH_FAST_PATH_RX_CQE_IP_BAD_XSUM_FLG | > > Thanks for fixing this bug ! > > Acked-by: Eric Dumazet <edumazet@google.com> Indeed - thanks Michal! Acked-by: Eilon Greenstein <eilong@broadcom.com> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 2012-09-14 at 08:20 +0300, Eilon Greenstein wrote: > On Fri, 2012-09-14 at 01:14 +0200, Eric Dumazet wrote: > > On Fri, 2012-09-14 at 00:59 +0200, Michal Schmidt wrote: > > > Commit d6cb3e41 "bnx2x: fix checksum validation" caused a performance > > > regression for IPv6. Rx checksum offload does not work. IPv6 packets > > > are passed to the stack with CHECKSUM_NONE. > > > > > > The hardware obviously cannot perform IP checksum validation for IPv6, > > > because there is no checksum in the IPv6 header. This should not prevent > > > us from setting CHECKSUM_UNNECESSARY. > > > > > > Tested on BCM57711. > > > > > > Signed-off-by: Michal Schmidt <mschmidt@redhat.com> > > > --- > > > drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 12 +++++++----- > > > 1 file changed, 7 insertions(+), 5 deletions(-) > > > > > > diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > > index af20c6e..e8e97a7 100644 > > > --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > > +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c > > > @@ -662,14 +662,16 @@ void bnx2x_csum_validate(struct sk_buff *skb, union eth_rx_cqe *cqe, > > > struct bnx2x_fastpath *fp, > > > struct bnx2x_eth_q_stats *qstats) > > > { > > > - /* Do nothing if no IP/L4 csum validation was done */ > > > - > > > + /* Do nothing if no L4 csum validation was done. > > > + * We do not check whether IP csum was validated. For IPv4 we assume > > > + * that if the card got as far as validating the L4 csum, it also > > > + * validated the IP csum. IPv6 has no IP csum. > > > + */ > > > if (cqe->fast_path_cqe.status_flags & > > > - (ETH_FAST_PATH_RX_CQE_IP_XSUM_NO_VALIDATION_FLG | > > > - ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG)) > > > + ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG) > > > return; > > > > > > - /* If both IP/L4 validation were done, check if an error was found. */ > > > + /* If L4 validation was done, check if an error was found. */ > > > > > > if (cqe->fast_path_cqe.type_error_flags & > > > (ETH_FAST_PATH_RX_CQE_IP_BAD_XSUM_FLG | > > > > Thanks for fixing this bug ! > > > > Acked-by: Eric Dumazet <edumazet@google.com> > > Indeed - thanks Michal! > > Acked-by: Eilon Greenstein <eilong@broadcom.com> > Just in case someone will look up this thread in the future, I’m adding some details: the comment is almost right, the HW does not verify the IPv6 header in case it contains extension headers this is why this patch is required (though some users with IPv6 that does not use any extension headers will not see the issue). In other words: Eric this is how we both missed it… -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Fri, 14 Sep 2012 01:14:39 +0200 > On Fri, 2012-09-14 at 00:59 +0200, Michal Schmidt wrote: >> Commit d6cb3e41 "bnx2x: fix checksum validation" caused a performance >> regression for IPv6. Rx checksum offload does not work. IPv6 packets >> are passed to the stack with CHECKSUM_NONE. >> >> The hardware obviously cannot perform IP checksum validation for IPv6, >> because there is no checksum in the IPv6 header. This should not prevent >> us from setting CHECKSUM_UNNECESSARY. >> >> Tested on BCM57711. >> >> Signed-off-by: Michal Schmidt <mschmidt@redhat.com> ... > Thanks for fixing this bug ! > > Acked-by: Eric Dumazet <edumazet@google.com> > > Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c index af20c6e..e8e97a7 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -662,14 +662,16 @@ void bnx2x_csum_validate(struct sk_buff *skb, union eth_rx_cqe *cqe, struct bnx2x_fastpath *fp, struct bnx2x_eth_q_stats *qstats) { - /* Do nothing if no IP/L4 csum validation was done */ - + /* Do nothing if no L4 csum validation was done. + * We do not check whether IP csum was validated. For IPv4 we assume + * that if the card got as far as validating the L4 csum, it also + * validated the IP csum. IPv6 has no IP csum. + */ if (cqe->fast_path_cqe.status_flags & - (ETH_FAST_PATH_RX_CQE_IP_XSUM_NO_VALIDATION_FLG | - ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG)) + ETH_FAST_PATH_RX_CQE_L4_XSUM_NO_VALIDATION_FLG) return; - /* If both IP/L4 validation were done, check if an error was found. */ + /* If L4 validation was done, check if an error was found. */ if (cqe->fast_path_cqe.type_error_flags & (ETH_FAST_PATH_RX_CQE_IP_BAD_XSUM_FLG |
Commit d6cb3e41 "bnx2x: fix checksum validation" caused a performance regression for IPv6. Rx checksum offload does not work. IPv6 packets are passed to the stack with CHECKSUM_NONE. The hardware obviously cannot perform IP checksum validation for IPv6, because there is no checksum in the IPv6 header. This should not prevent us from setting CHECKSUM_UNNECESSARY. Tested on BCM57711. Signed-off-by: Michal Schmidt <mschmidt@redhat.com> --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)