diff mbox series

[v4] net: fix Intel-specific Prepare the outer IPv4 hdr for checksum

Message ID 20210907104916.27560-1-mohsin.kazmi14@gmail.com (mailing list archive)
State Accepted, archived
Delegated to: Ferruh Yigit
Headers
Series [v4] net: fix Intel-specific Prepare the outer IPv4 hdr for checksum |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/github-robot: build success github build: passed
ci/iol-broadcom-Performance success Performance Testing PASS
ci/iol-broadcom-Functional success Functional Testing PASS
ci/iol-aarch64-compile-testing success Testing PASS
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-x86_64-unit-testing success Testing PASS
ci/iol-intel-Functional success Functional Testing PASS
ci/Intel-compilation success Compilation OK
ci/intel-Testing success Testing PASS
ci/iol-x86_64-compile-testing success Testing PASS
ci/iol-mellanox-Performance success Performance Testing PASS

Commit Message

Mohsin Kazmi Sept. 7, 2021, 10:49 a.m. UTC 
  Preparation of the headers for the hardware offload
misses the outer IPv4 checksum offload.
It results in bad checksum computed by hardware NIC.

This patch fixes the issue by setting the outer IPv4
checksum field to 0.

Fixes: 4fb7e803eb1a ("ethdev: add Tx preparation")
Cc: stable@dpdk.org

Signed-off-by: Mohsin Kazmi <mohsin.kazmi14@gmail.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
---
v4:
   * Update the commit message

v3:
   * Update the conditional test with PKT_TX_OUTER_IP_CKSUM.
   * Update the commit title with "Intel-specific".

v2:
   * Update the commit message with Fixes.

 lib/net/rte_net.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Comments

Ferruh Yigit Sept. 15, 2021, 10:39 a.m. UTC | #1 
On 9/7/2021 11:49 AM, Mohsin Kazmi wrote:
> Preparation of the headers for the hardware offload
> misses the outer IPv4 checksum offload.
> It results in bad checksum computed by hardware NIC.
> 
> This patch fixes the issue by setting the outer IPv4
> checksum field to 0.
> 
> Fixes: 4fb7e803eb1a ("ethdev: add Tx preparation")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Mohsin Kazmi <mohsin.kazmi14@gmail.com>
> Acked-by: Qi Zhang <qi.z.zhang@intel.com>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>

<...>

> diff --git a/lib/net/rte_net.h b/lib/net/rte_net.h
> index 434435ffa2..42639bc154 100644
> --- a/lib/net/rte_net.h
> +++ b/lib/net/rte_net.h
> @@ -125,11 +125,22 @@ rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)

Not directly related with this patch, but is the function
'rte_net_intel_cksum_flags_prepare()' really Intel specific?

I can see sfc & ena are also using this function, should we rename it?
Ferruh Yigit Sept. 15, 2021, 11:04 a.m. UTC | #2 
On 9/7/2021 11:49 AM, Mohsin Kazmi wrote:
> Preparation of the headers for the hardware offload
> misses the outer IPv4 checksum offload.
> It results in bad checksum computed by hardware NIC.
> 
> This patch fixes the issue by setting the outer IPv4
> checksum field to 0.
> 
> Fixes: 4fb7e803eb1a ("ethdev: add Tx preparation")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Mohsin Kazmi <mohsin.kazmi14@gmail.com>
> Acked-by: Qi Zhang <qi.z.zhang@intel.com>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>

Applied to dpdk-next-net/main, thanks.

Patch title updated as following while merging:
net: fix checksum offload for outer IPv4
diff mbox series

Patch

diff --git a/lib/net/rte_net.h b/lib/net/rte_net.h
index 434435ffa2..42639bc154 100644
--- a/lib/net/rte_net.h
+++ b/lib/net/rte_net.h
@@ -125,11 +125,22 @@  rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)
 	 * Mainly it is required to avoid fragmented headers check if
 	 * no offloads are requested.
 	 */
-	if (!(ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK | PKT_TX_TCP_SEG)))
+	if (!(ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK | PKT_TX_TCP_SEG |
+			  PKT_TX_OUTER_IP_CKSUM)))
 		return 0;
 
-	if (ol_flags & (PKT_TX_OUTER_IPV4 | PKT_TX_OUTER_IPV6))
+	if (ol_flags & (PKT_TX_OUTER_IPV4 | PKT_TX_OUTER_IPV6)) {
 		inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
+		/*
+		 * prepare outer IPv4 header checksum by setting it to 0,
+		 * in order to be computed by hardware NICs.
+		 */
+		if (ol_flags & PKT_TX_OUTER_IP_CKSUM) {
+			ipv4_hdr = rte_pktmbuf_mtod_offset(m,
+					struct rte_ipv4_hdr *, m->outer_l2_len);
+			ipv4_hdr->hdr_checksum = 0;
+		}
+	}
 
 	/*
 	 * Check if headers are fragmented.