[ovs-dev] [PATCH] netdev-offload-dpdk: Fix for broken ethernet matching HWOL for XL710 NIC
Ilya Maximets
i.maximets at ovn.org
Fri Aug 14 10:45:14 UTC 2020
On 8/14/20 10:58 AM, Stokes, Ian wrote:
>>> -----Original Message-----
>>> From: Ilya Maximets <i.maximets at ovn.org>
>>> Sent: Thursday, August 13, 2020 9:26 PM
>>> To: Emma Finn <emma.finn at intel.com>; dev at openvswitch.org
>>> Cc: ian.stokes at intel.com; i.maximets at ovn.org; Eli Britstein
>>> <elibr at nvidia.com>; beilei.xing at intel.com; i.maximets at ovn.org
>>> Subject: Re: [PATCH] netdev-offload-dpdk: Fix for broken ethernet
>>> matching HWOL for XL710 NIC
>>>
>>>
>>> On 8/13/20 6:13 PM, Emma Finn wrote:
>>>> This patch introduces a temporary work around to fix partial hardware
>>>> offload for XL710 devices. Currently the incorrect ethernet pattern
>>>> is being set. This patch will be removed once this issue is fixed
>>>> within the i40e PMD.
>>>>
>>>> Signed-off-by: Emma Finn <emma.finn at intel.com>
>>>> Signed-off-by: Eli Britstein <elibr at nvidia.com>
>>>> Co-authored-by: Eli Britstein <elibr at nvidia.com>
>>>> ---
>>>> lib/netdev-offload-dpdk.c | 35 +++++++++++++++++++++++++----------
>>>> 1 file changed, 25 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/lib/netdev-offload-dpdk.c b/lib/netdev-offload-dpdk.c
>>>> index de6101e..ede2077 100644
>>>> --- a/lib/netdev-offload-dpdk.c
>>>> +++ b/lib/netdev-offload-dpdk.c
>>>> @@ -672,10 +672,24 @@ free_flow_actions(struct flow_actions *actions)
>>>> actions->cnt = 0;
>>>> }
>>>>
>>>> +/*
>>>> +* This is a temporary work around to fix ethernet pattern for
>>>> +partial hardware
>>>> +* offload for X710 devices. This fix will be reverted once the issue
>>>> +is fixed
>>>> +* within the i40e PMD driver.
>>>> +*/
>>>> +#define NULL_ETH_MASK_IF_ZEROS \
>>>> + if (eth_mask && is_all_zeros(ð_mask->src, sizeof eth_mask->src) && \
>>>> + is_all_zeros(ð_mask->dst, sizeof eth_mask->dst)) { \
>>>> + patterns->items[0].mask = NULL; \
>>>> + free(eth_mask); \
>>>> + }
>>>
>>> Could you please address my comments from this e-mail:
>>>
>>> https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.
>>> op
>>> envswitch.org%2Fpipermail%2Fovs-dev%2F2020-
>>> August%2F373873.html&data=02%7C01%7Celibr%40nvidia.com%7C08c8f
>>> a0338e14858343d08d83fb664bf%7C43083d15727340c1b7db39efd9ccc17a%
>>> 7C0%7C1%7C637329399898256323&sdata=bM8dq1Da0%2F%2FL7m7y
>>> m470T1aClwH9ZE%2BhlNcED1m7sdQ%3D&reserved=0
>>> ?
>>>
>>> i.e. convert this macro definition into function.
>> My previous patch was a POC. Here is a more "nicer" one. No macro/function,
>> and no redundant allocation/free:
>> Need to test and obviously finalize.
>
> Thanks for this Eli, just a heads up Emma is out of office today but I can test this and submit the v2 if you prefer?
>
> @Ilya, what are your thoughts on this approach below?
It looks fine, but I'd re-write the if statement in a following way:
if (match->wc.masks.dl_type == 0xffff && is_ip_any(&match->flow)
&& eth_addr_is_zero(match->wc.masks.dl_dst)
&& eth_addr_is_zero(match->wc.masks.dl_src)) {
i.e. lightweight operations first, special functions for the flow type
and eth_addr checking.
>
> BR
> Ian
>>
>> diff --git a/lib/netdev-offload-dpdk.c b/lib/netdev-offload-dpdk.c index
>> de6101e4d..c6d293af3 100644
>> --- a/lib/netdev-offload-dpdk.c
>> +++ b/lib/netdev-offload-dpdk.c
>> @@ -696,16 +696,26 @@ parse_flow_match(struct flow_patterns *patterns,
>> !eth_addr_is_zero(match->wc.masks.dl_dst)) {
>> struct rte_flow_item_eth *spec, *mask;
>>
>> - spec = xzalloc(sizeof *spec);
>> - mask = xzalloc(sizeof *mask);
>> + /* WRITE A COMMENT ABOUT THIS WORKAROUND. */
>> + if (is_all_zeros(&match->wc.masks.dl_dst, sizeof mask->dst) &&
>> + is_all_zeros(&match->wc.masks.dl_src, sizeof mask->src) &&
>> + match->wc.masks.dl_type == 0xFFFF &&
>> + (match->flow.dl_type == htons(ETH_TYPE_IP) ||
>> + match->flow.dl_type == htons(ETH_TYPE_IPV6))) {
>> + spec = NULL;
>> + mask = NULL;
>> + } else {
>> + spec = xzalloc(sizeof *spec);
>> + mask = xzalloc(sizeof *mask);
>>
>> - memcpy(&spec->dst, &match->flow.dl_dst, sizeof spec->dst);
>> - memcpy(&spec->src, &match->flow.dl_src, sizeof spec->src);
>> - spec->type = match->flow.dl_type;
>> + memcpy(&spec->dst, &match->flow.dl_dst, sizeof spec->dst);
>> + memcpy(&spec->src, &match->flow.dl_src, sizeof spec->src);
>> + spec->type = match->flow.dl_type;
>>
>> - memcpy(&mask->dst, &match->wc.masks.dl_dst, sizeof mask->dst);
>> - memcpy(&mask->src, &match->wc.masks.dl_src, sizeof mask->src);
>> - mask->type = match->wc.masks.dl_type;
>> + memcpy(&mask->dst, &match->wc.masks.dl_dst, sizeof mask->dst);
>> + memcpy(&mask->src, &match->wc.masks.dl_src, sizeof mask->src);
>> + mask->type = match->wc.masks.dl_type;
>> + }
>>
>> memset(&consumed_masks->dl_dst, 0, sizeof consumed_masks->dl_dst);
>> memset(&consumed_masks->dl_src, 0, sizeof consumed_masks->dl_src);
>>>
>>>> +
>>>> static int
>>>> parse_flow_match(struct flow_patterns *patterns,
>>>> struct match *match) {
>>>> + struct rte_flow_item_eth *eth_mask = NULL;
>>>> + struct rte_flow_item_eth *eth_spec = NULL;
>>>> uint8_t *next_proto_mask = NULL;
>>>> struct flow *consumed_masks;
>>>> uint8_t proto = 0;
>>>> @@ -694,24 +708,23 @@ parse_flow_match(struct flow_patterns *patterns,
>>>> if (match->wc.masks.dl_type ||
>>>> !eth_addr_is_zero(match->wc.masks.dl_src) ||
>>>> !eth_addr_is_zero(match->wc.masks.dl_dst)) {
>>>> - struct rte_flow_item_eth *spec, *mask;
>>>>
>>>> - spec = xzalloc(sizeof *spec);
>>>> - mask = xzalloc(sizeof *mask);
>>>> + eth_spec = xzalloc(sizeof *eth_spec);
>>>> + eth_mask = xzalloc(sizeof *eth_mask);
>>>>
>>>> - memcpy(&spec->dst, &match->flow.dl_dst, sizeof spec->dst);
>>>> - memcpy(&spec->src, &match->flow.dl_src, sizeof spec->src);
>>>> - spec->type = match->flow.dl_type;
>>>> + memcpy(ð_spec->dst, &match->flow.dl_dst, sizeof eth_spec->dst);
>>>> + memcpy(ð_spec->src, &match->flow.dl_src, sizeof eth_spec->src);
>>>> + eth_spec->type = match->flow.dl_type;
>>>>
>>>> - memcpy(&mask->dst, &match->wc.masks.dl_dst, sizeof mask->dst);
>>>> - memcpy(&mask->src, &match->wc.masks.dl_src, sizeof mask->src);
>>>> - mask->type = match->wc.masks.dl_type;
>>>> + memcpy(ð_mask->dst, &match->wc.masks.dl_dst, sizeof
>>>> + eth_mask-
>>>> dst);
>>>> + memcpy(ð_mask->src, &match->wc.masks.dl_src, sizeof
>>>> + eth_mask-
>>>> src);
>>>> + eth_mask->type = match->wc.masks.dl_type;
>>>>
>>>> memset(&consumed_masks->dl_dst, 0, sizeof consumed_masks-
>>> dl_dst);
>>>> memset(&consumed_masks->dl_src, 0, sizeof consumed_masks-
>>> dl_src);
>>>> consumed_masks->dl_type = 0;
>>>>
>>>> - add_flow_pattern(patterns, RTE_FLOW_ITEM_TYPE_ETH, spec, mask);
>>>> + add_flow_pattern(patterns, RTE_FLOW_ITEM_TYPE_ETH, eth_spec,
>>>> + eth_mask);
>>>> }
>>>>
>>>> /* VLAN */
>>>> @@ -738,6 +751,7 @@ parse_flow_match(struct flow_patterns *patterns,
>>>> /* IP v4 */
>>>> if (match->flow.dl_type == htons(ETH_TYPE_IP)) {
>>>> struct rte_flow_item_ipv4 *spec, *mask;
>>>
>>> Empty line needed.
>>>
>>>> + NULL_ETH_MASK_IF_ZEROS;
>>>>
>>>> spec = xzalloc(sizeof *spec);
>>>> mask = xzalloc(sizeof *mask); @@ -776,6 +790,7 @@
>>>> parse_flow_match(struct flow_patterns *patterns,
>>>> /* IP v6 */
>>>> if (match->flow.dl_type == htons(ETH_TYPE_IPV6)) {
>>>> struct rte_flow_item_ipv6 *spec, *mask;
>>>
>>> ditto.
>>>
>>>> + NULL_ETH_MASK_IF_ZEROS;
>>>>
>>>> spec = xzalloc(sizeof *spec);
>>>> mask = xzalloc(sizeof *mask);
>>>>
>
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