> Now the port Rx offload mode is set to RTE_ETH_RX_OFFLOAD_CHECKSUM
> by default, but some hw and/or virtual interface does not support
> the offload mode presupposed, e.g., some virtio interfaces in
> the cloud may only partly support RTE_ETH_RX_OFFLOAD_UDP_CKSUM/
> RTE_ETH_RX_OFFLOAD_TCP_CKSUM,
> but not RTE_ETH_RX_OFFLOAD_IPV4_CKSUM, and the error msg here:
>
> Ethdev port_id=0 requested Rx offloads 0xe does not match Rx offloads
> capabilities 0x201d in rte_eth_dev_configure()
>
> So to enable the l3fwd running in that environment, the Rx mode requirement
> can be relaxed to reflect the hardware feature reality here with an option
> relax_rx_offload, and the l3fwd can run smoothly then.
> A warning msg would be provided to user in case it happens here.
>
> On the other side, enabling the software cksum check in case missing the
> hw support.
>
> The relax action for rx cksum offload is just enabled when
> relax_rx_offload is true which is false by default.
>
> Signed-off-by: Trevor Tao <taozj...@163.com>
> ---
> examples/l3fwd/l3fwd.h | 12 ++++++++++--
> examples/l3fwd/l3fwd_em.h | 2 +-
> examples/l3fwd/l3fwd_lpm.h | 2 +-
> examples/l3fwd/main.c | 24 ++++++++++++++++++++++++
> 4 files changed, 36 insertions(+), 4 deletions(-)
>
> diff --git a/examples/l3fwd/l3fwd.h b/examples/l3fwd/l3fwd.h
> index b55855c932..e7ae0e5834 100644
> --- a/examples/l3fwd/l3fwd.h
> +++ b/examples/l3fwd/l3fwd.h
> @@ -159,7 +159,7 @@ send_single_packet(struct lcore_conf *qconf,
>
> #ifdef DO_RFC_1812_CHECKS
> static inline int
> -is_valid_ipv4_pkt(struct rte_ipv4_hdr *pkt, uint32_t link_len)
> +is_valid_ipv4_pkt(struct rte_ipv4_hdr *pkt, uint32_t link_len, uint64_t
> ol_flags)
> {
> /* From http://www.rfc-editor.org/rfc/rfc1812.txt section 5.2.2 */
> /*
> @@ -170,7 +170,15 @@ is_valid_ipv4_pkt(struct rte_ipv4_hdr *pkt, uint32_t
> link_len)
> return -1;
>
> /* 2. The IP checksum must be correct. */
> - /* this is checked in H/W */
> + /* if this is not checked in H/W, check it. */
> + if ((ol_flags & RTE_MBUF_F_RX_IP_CKSUM_MASK) ==
> RTE_MBUF_F_RX_IP_CKSUM_NONE) {
Actually, we probably also need to check for RTE_MBUF_F_RX_IP_CKSUM_BAD,
But that is a subject for another patch (fix actually).
Acked-by: Konstantin Ananyev <konstantin.anan...@huawei.com>
> + uint16_t actual_cksum, expected_cksum;
> + actual_cksum = pkt->hdr_checksum;
> + pkt->hdr_checksum = 0;
> + expected_cksum = rte_ipv4_cksum(pkt);
> + if (actual_cksum != expected_cksum)
> + return -2;
> + }
>
> /*
> * 3. The IP version number must be 4. If the version number is not 4
> diff --git a/examples/l3fwd/l3fwd_em.h b/examples/l3fwd/l3fwd_em.h
> index 7d051fc076..1fee2e2e6c 100644
> --- a/examples/l3fwd/l3fwd_em.h
> +++ b/examples/l3fwd/l3fwd_em.h
> @@ -20,7 +20,7 @@ l3fwd_em_handle_ipv4(struct rte_mbuf *m, uint16_t portid,
>
> #ifdef DO_RFC_1812_CHECKS
> /* Check to make sure the packet is valid (RFC1812) */
> - if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len) < 0) {
> + if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len, m->ol_flags) < 0) {
> rte_pktmbuf_free(m);
> return BAD_PORT;
> }
> diff --git a/examples/l3fwd/l3fwd_lpm.h b/examples/l3fwd/l3fwd_lpm.h
> index c61b969584..4ee61e8d88 100644
> --- a/examples/l3fwd/l3fwd_lpm.h
> +++ b/examples/l3fwd/l3fwd_lpm.h
> @@ -22,7 +22,7 @@ l3fwd_lpm_simple_forward(struct rte_mbuf *m, uint16_t
> portid,
>
> #ifdef DO_RFC_1812_CHECKS
> /* Check to make sure the packet is valid (RFC1812) */
> - if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len) < 0) {
> + if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len, m->ol_flags) < 0) {
> rte_pktmbuf_free(m);
> return;
> }
> diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
> index b42365ef1b..851e7e68f9 100644
> --- a/examples/l3fwd/main.c
> +++ b/examples/l3fwd/main.c
> @@ -74,6 +74,8 @@ static int numa_on = 1; /**< NUMA is enabled by default. */
> static int parse_ptype; /**< Parse packet type using rx callback, and */
> /**< disabled by default */
> static int disable_rss; /**< Disable the RX RSS mode */
> +static int relax_rx_offload; /**< Relax RX offload mode, and */
> + /**< disabled by default */
> static int per_port_pool; /**< Use separate buffer pools per port; disabled
> */
> /**< by default */
>
> @@ -680,6 +682,7 @@ static const char short_options[] =
> #define CMD_LINE_OPT_HASH_ENTRY_NUM "hash-entry-num"
> #define CMD_LINE_OPT_PARSE_PTYPE "parse-ptype"
> #define CMD_LINE_OPT_DISABLE_RSS "disable-rss"
> +#define CMD_LINE_OPT_RELAX_RX_OFFLOAD "relax-rx-offload"
> #define CMD_LINE_OPT_PER_PORT_POOL "per-port-pool"
> #define CMD_LINE_OPT_MODE "mode"
> #define CMD_LINE_OPT_EVENTQ_SYNC "eventq-sched"
> @@ -708,6 +711,7 @@ enum {
> CMD_LINE_OPT_HASH_ENTRY_NUM_NUM,
> CMD_LINE_OPT_PARSE_PTYPE_NUM,
> CMD_LINE_OPT_DISABLE_RSS_NUM,
> + CMD_LINE_OPT_RELAX_RX_OFFLOAD_NUM,
> CMD_LINE_OPT_RULE_IPV4_NUM,
> CMD_LINE_OPT_RULE_IPV6_NUM,
> CMD_LINE_OPT_ALG_NUM,
> @@ -731,6 +735,7 @@ static const struct option lgopts[] = {
> {CMD_LINE_OPT_MAX_PKT_LEN, 1, 0, CMD_LINE_OPT_MAX_PKT_LEN_NUM},
> {CMD_LINE_OPT_HASH_ENTRY_NUM, 1, 0, CMD_LINE_OPT_HASH_ENTRY_NUM_NUM},
> {CMD_LINE_OPT_PARSE_PTYPE, 0, 0, CMD_LINE_OPT_PARSE_PTYPE_NUM},
> + {CMD_LINE_OPT_RELAX_RX_OFFLOAD, 0, 0,
> CMD_LINE_OPT_RELAX_RX_OFFLOAD_NUM},
> {CMD_LINE_OPT_DISABLE_RSS, 0, 0, CMD_LINE_OPT_DISABLE_RSS_NUM},
> {CMD_LINE_OPT_PER_PORT_POOL, 0, 0, CMD_LINE_OPT_PARSE_PER_PORT_POOL},
> {CMD_LINE_OPT_MODE, 1, 0, CMD_LINE_OPT_MODE_NUM},
> @@ -857,6 +862,11 @@ parse_args(int argc, char **argv)
> parse_ptype = 1;
> break;
>
> + case CMD_LINE_OPT_RELAX_RX_OFFLOAD_NUM:
> + printf("Relax rx offload mode is enabled\n");
> + relax_rx_offload = 1;
> + break;
> +
> case CMD_LINE_OPT_DISABLE_RSS_NUM:
> printf("Disable RX RSS\n");
> disable_rss = 1;
> @@ -1278,6 +1288,20 @@ l3fwd_poll_resource_setup(void)
> local_port_conf.rx_adv_conf.rss_conf.rss_hf);
> }
>
> + /* relax the rx offload requirement */
> + if ((local_port_conf.rxmode.offloads &
> dev_info.rx_offload_capa) !=
> + local_port_conf.rxmode.offloads) {
> + printf("Port %u requested Rx offloads 0x%"PRIx64" does
> not"
> + " match Rx offloads capabilities 0x%"PRIx64"\n",
> + portid, local_port_conf.rxmode.offloads,
> + dev_info.rx_offload_capa);
> + if (relax_rx_offload) {
> + local_port_conf.rxmode.offloads &=
> dev_info.rx_offload_capa;
> + printf("warning: modified the rx offload to
> 0x%"PRIx64" based on device"
> + " capability\n",
> local_port_conf.rxmode.offloads);
> + }
> + }
> +
> ret = rte_eth_dev_configure(portid, nb_rx_queue,
> (uint16_t)n_tx_queue, &local_port_conf);
> if (ret < 0)
> --
> 2.34.1
