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From: Olivier MATZ <olivier.matz@6wind.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	 "dev@dpdk.org" <dev@dpdk.org>
Cc: "jigsaw@gmail.com" <jigsaw@gmail.com>
Subject: Re: [dpdk-dev] [PATCH v4 08/13] testpmd: rework csum forward engine
Date: Thu, 27 Nov 2014 10:10:31 +0100	[thread overview]
Message-ID: <5476EA87.4040807@6wind.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB977258213BAA86@IRSMSX105.ger.corp.intel.com>

Hi Konstantin,

On 11/26/2014 09:02 PM, Ananyev, Konstantin wrote:
>> +/* if possible, calculate the checksum of a packet in hw or sw,
>> + * depending on the testpmd command line configuration */
>> +static uint64_t
>> +process_inner_cksums(void *l3_hdr, uint16_t ethertype, uint16_t l3_len,
>> +	uint8_t l4_proto, uint16_t testpmd_ol_flags)
>> +{
>> +	struct ipv4_hdr *ipv4_hdr = l3_hdr;
>> +	struct udp_hdr *udp_hdr;
>> +	struct tcp_hdr *tcp_hdr;
>> +	struct sctp_hdr *sctp_hdr;
>> +	uint64_t ol_flags = 0;
>> +
>> +	if (ethertype == _htons(ETHER_TYPE_IPv4)) {
>> +		ipv4_hdr = l3_hdr;
>> +		ipv4_hdr->hdr_checksum = 0;
>> +
>> +		if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_IP_CKSUM)
>> +			ol_flags |= PKT_TX_IP_CKSUM;
>> +		else
>> +			ipv4_hdr->hdr_checksum = get_ipv4_cksum(ipv4_hdr);
>> +
>> +		ol_flags |= PKT_TX_IPV4;
>
> Flags PKT_TX_IP_CKSUM, PKT_TX_IPV4, PKT_TX_IPV6 are all mutually exclusive.
> So it should be, I think:
>
> if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_IP_CKSUM) {
>              ol_flags |= PKT_TX_IP_CKSUM;
>   } else {
>               ipv4_hdr->hdr_checksum = get_ipv4_cksum(ipv4_hdr);
>               ol_flags |= PKT_TX_IPV4;
> }

It seems normal that PKT_TX_IPV4 are PKT_TX_IPV6 exclusive, but do you
mean that PKT_TX_IP_CKSUM and PKT_TX_IPV4 are exclusive too? It looks
strange to me.

My understanding of the meaning of the flags is:

   - PKT_TX_IP_CKSUM: tell the NIC to compute IP cksum

   - PKT_TX_IPV4: tell the NIC it's an IPv4 packet. Required for L4
     checksum offload or TSO.

   - PKT_TX_IPV6: tell the NIC it's an IPv6 packet. Required for L4
     checksum offload or TSO.

If it's a i40e driver requirement, don't you think it's better to change
the driver?

>> +/* Calculate the checksum of outer header (only vxlan is supported,
>> + * meaning IP + UDP). The caller already checked that it's a vxlan
>> + * packet */
>> +static uint64_t
>> +process_outer_cksums(void *outer_l3_hdr, uint16_t outer_ethertype,
>> +	uint16_t outer_l3_len, uint16_t testpmd_ol_flags)
>> +{
>> +	struct ipv4_hdr *ipv4_hdr = outer_l3_hdr;
>> +	struct ipv6_hdr *ipv6_hdr = outer_l3_hdr;
>> +	struct udp_hdr *udp_hdr;
>> +	uint64_t ol_flags = 0;
>> +
>> +	if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM)
>> +		ol_flags |= PKT_TX_VXLAN_CKSUM;
>> +
>> +	if (outer_ethertype == _htons(ETHER_TYPE_IPv4)) {
>> +		ipv4_hdr->hdr_checksum = 0;
>> +
>> +		if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM) == 0)
>> +			ipv4_hdr->hdr_checksum = get_ipv4_cksum(ipv4_hdr);
>> +	}
>> +
>> +	udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + outer_l3_len);
>> +	/* do not recalculate udp cksum if it was 0 */
>> +	if (udp_hdr->dgram_cksum != 0) {
>> +		udp_hdr->dgram_cksum = 0;
>> +		if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM) == 0) {
>
> In fact, FVL is not able to do HW caclualtion for outer L4, only outer IPV4 cksum is supported.
> So no need for:
> if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_UDP_CKSUM) {
> above.
> And yes, if user will select to calculate inner checksums by HW - outer UDP checksum might be invalid anyway.

I may have misunderstood how vxlan works, so I agree this code is
probably wrong. However, I don't find the line you are quoting in
the function above.

I'll check how Jijiang fixed the issue.

Regards,
Olivier

  parent reply	other threads:[~2014-11-27  9:10 UTC|newest]

Thread overview: 112+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-10 15:59 [dpdk-dev] [PATCH 00/12] add TSO support Olivier Matz
2014-11-10 15:59 ` [dpdk-dev] [PATCH 01/12] igb/ixgbe: fix IP checksum calculation Olivier Matz
2014-11-10 15:59 ` [dpdk-dev] [PATCH 02/12] ixgbe: fix remaining pkt_flags variable size to 64 bits Olivier Matz
2014-11-10 16:59   ` Bruce Richardson
2014-11-10 15:59 ` [dpdk-dev] [PATCH 03/12] mbuf: move vxlan_cksum flag definition at the proper place Olivier Matz
2014-11-10 17:09   ` Bruce Richardson
2014-11-10 15:59 ` [dpdk-dev] [PATCH 04/12] mbuf: add help about TX checksum flags Olivier Matz
2014-11-10 17:10   ` Bruce Richardson
2014-11-10 15:59 ` [dpdk-dev] [PATCH 05/12] mbuf: remove too specific PKT_TX_OFFLOAD_MASK definition Olivier Matz
2014-11-10 17:14   ` Bruce Richardson
2014-11-10 20:59     ` Olivier MATZ
2014-11-10 15:59 ` [dpdk-dev] [PATCH 06/12] mbuf: add functions to get the name of an ol_flag Olivier Matz
2014-11-10 17:29   ` Bruce Richardson
2014-11-10 20:54     ` Olivier MATZ
2014-11-12 17:21     ` Ananyev, Konstantin
2014-11-12 17:44       ` Olivier MATZ
2014-11-10 15:59 ` [dpdk-dev] [PATCH 07/12] mbuf: generic support for TCP segmentation offload Olivier Matz
2014-11-11  3:17   ` Liu, Jijiang
2014-11-12 13:09   ` Ananyev, Konstantin
2014-11-10 15:59 ` [dpdk-dev] [PATCH 08/12] ixgbe: support " Olivier Matz
2014-11-10 15:59 ` [dpdk-dev] [PATCH 09/12] testpmd: fix use of offload flags in testpmd Olivier Matz
2014-11-10 15:59 ` [dpdk-dev] [PATCH 10/12] testpmd: rework csum forward engine Olivier Matz
2014-11-11  8:35   ` Liu, Jijiang
2014-11-11  9:55     ` Olivier MATZ
2014-11-10 15:59 ` [dpdk-dev] [PATCH 11/12] testpmd: support TSO in " Olivier Matz
2014-11-10 15:59 ` [dpdk-dev] [PATCH 12/12] testpmd: add a verbose mode " Olivier Matz
2014-11-11  9:21 ` [dpdk-dev] [PATCH 00/12] add TSO support Olivier MATZ
2014-11-11  9:48   ` Olivier MATZ
2014-11-14 17:03 ` [dpdk-dev] [PATCH v2 00/13] " Olivier Matz
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 01/13] igb/ixgbe: fix IP checksum calculation Olivier Matz
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 02/13] ixgbe: fix remaining pkt_flags variable size to 64 bits Olivier Matz
2014-11-17 16:47     ` Walukiewicz, Miroslaw
2014-11-17 17:03       ` Olivier MATZ
2014-11-17 17:40         ` Thomas Monjalon
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 03/13] mbuf: move vxlan_cksum flag definition at the proper place Olivier Matz
2014-11-17 22:05     ` Thomas Monjalon
2014-11-18 14:10       ` Olivier MATZ
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 04/13] mbuf: add help about TX checksum flags Olivier Matz
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 05/13] mbuf: remove too specific PKT_TX_OFFLOAD_MASK definition Olivier Matz
2014-11-17 10:35     ` Bruce Richardson
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 06/13] mbuf: add functions to get the name of an ol_flag Olivier Matz
2014-11-17 10:39     ` Bruce Richardson
2014-11-17 12:51       ` Olivier MATZ
2014-11-17 19:00     ` Ananyev, Konstantin
2014-11-18  9:29       ` Olivier MATZ
2014-11-19 11:06         ` Ananyev, Konstantin
2014-11-25 10:37           ` Ananyev, Konstantin
2014-11-25 12:15             ` Zhang, Helin
2014-11-25 12:37               ` Olivier MATZ
2014-11-25 13:31                 ` Zhang, Helin
2014-11-25 13:49               ` Ananyev, Konstantin
2014-11-26  0:58                 ` Zhang, Helin
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 07/13] testpmd: fix use of offload flags in testpmd Olivier Matz
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 08/13] testpmd: rework csum forward engine Olivier Matz
2014-11-17  8:11     ` Liu, Jijiang
2014-11-17 13:00       ` Olivier MATZ
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 09/13] mbuf: introduce new checksum API Olivier Matz
2014-11-17 18:15     ` Ananyev, Konstantin
2014-11-18  9:10       ` Olivier MATZ
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 10/13] mbuf: generic support for TCP segmentation offload Olivier Matz
2014-11-17 23:33     ` Ananyev, Konstantin
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 11/13] ixgbe: support " Olivier Matz
2014-11-17 18:26     ` Ananyev, Konstantin
2014-11-18  9:11       ` Olivier MATZ
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 12/13] testpmd: support TSO in csum forward engine Olivier Matz
2014-11-14 17:03   ` [dpdk-dev] [PATCH v2 13/13] testpmd: add a verbose mode " Olivier Matz
2014-11-20 22:58   ` [dpdk-dev] [PATCH v3 00/13] add TSO support Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 01/13] igb/ixgbe: fix IP checksum calculation Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 02/13] ixgbe: fix remaining pkt_flags variable size to 64 bits Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 03/13] mbuf: reorder tx ol_flags Olivier Matz
2014-11-25 10:22       ` Thomas Monjalon
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 04/13] mbuf: add help about TX checksum flags Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 05/13] mbuf: remove too specific PKT_TX_OFFLOAD_MASK definition Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 06/13] mbuf: add functions to get the name of an ol_flag Olivier Matz
2014-11-25 10:23       ` Thomas Monjalon
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 07/13] testpmd: fix use of offload flags in testpmd Olivier Matz
2014-11-25 11:52       ` Ananyev, Konstantin
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 08/13] testpmd: rework csum forward engine Olivier Matz
2014-11-26 10:10       ` Ananyev, Konstantin
2014-11-26 11:14         ` Olivier MATZ
2014-11-26 12:25           ` Ananyev, Konstantin
2014-11-26 14:55             ` Olivier MATZ
2014-11-26 16:34               ` Ananyev, Konstantin
2014-11-27  8:34                 ` Liu, Jijiang
2014-11-26 13:59           ` Liu, Jijiang
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 09/13] mbuf: introduce new checksum API Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 10/13] mbuf: generic support for TCP segmentation offload Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 11/13] ixgbe: support " Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 12/13] testpmd: support TSO in csum forward engine Olivier Matz
2014-11-20 22:58     ` [dpdk-dev] [PATCH v3 13/13] testpmd: add a verbose mode " Olivier Matz
2014-11-26 15:04     ` [dpdk-dev] [PATCH v4 00/13] add TSO support Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 01/13] igb/ixgbe: fix IP checksum calculation Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 02/13] ixgbe: fix remaining pkt_flags variable size to 64 bits Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 03/13] mbuf: reorder tx ol_flags Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 04/13] mbuf: add help about TX checksum flags Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 05/13] mbuf: remove too specific PKT_TX_OFFLOAD_MASK definition Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 06/13] mbuf: add functions to get the name of an ol_flag Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 07/13] testpmd: fix use of offload flags in testpmd Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 08/13] testpmd: rework csum forward engine Olivier Matz
2014-11-26 20:02         ` Ananyev, Konstantin
2014-11-27  8:26           ` Liu, Jijiang
2014-11-27  9:10           ` Olivier MATZ [this message]
2014-11-27 11:02             ` Ananyev, Konstantin
2014-11-28  8:54               ` Liu, Jijiang
2014-11-28  9:54                 ` Olivier MATZ
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 09/13] mbuf: introduce new checksum API Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 10/13] mbuf: generic support for TCP segmentation offload Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 11/13] ixgbe: support " Olivier Matz
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 12/13] testpmd: support TSO in csum forward engine Olivier Matz
2014-11-26 21:23         ` Ananyev, Konstantin
2014-11-26 15:04       ` [dpdk-dev] [PATCH v4 13/13] testpmd: add a verbose mode " Olivier Matz
2014-11-26 18:30       ` [dpdk-dev] [PATCH v4 00/13] add TSO support Thomas Monjalon

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