Re: [PATCH] app/testpmd: fix MAC header in csum forward engine

["lihuisong (C)" <lihuisong@huawei.com>]

在 2022/10/26 19:07, Gregory Etelson 写道:
> MLX5 SR-IOV TX engine will not transmit Ethernet frame
> if destination MAC address matched local port address. The frame ether
> looped-back to RX or dropped, depending on the port configuration.
>
> Application running over MLX5 SR-IOV port cannot transmit packet
> polled from RX queue as-is. The packet Ethernet destination address
> must be changed.
>
> The patch adds new run-time configuration parameter to the `csum`
> forwarding engine to control MAC addresses configuration:
>
> testpmd> csum mac-swap on|off <port_id>
>
> `mac-swap on`  replace MAC addresses.
> `mac-swap off` keep Ethernet header unchanged.
>
> Fixes: 9b4ea7ae77fa ("app/testpmd: revert MAC update in checksum forwarding")
> Signed-off-by: Gregory Etelson <getelson@nvidia.com>
> ---
>   app/test-pmd/cmdline.c  | 50 +++++++++++++++++++++++++++++++++++++++++
>   app/test-pmd/csumonly.c |  6 +++++
>   app/test-pmd/testpmd.c  |  5 +++--
>   app/test-pmd/testpmd.h  |  3 ++-
>   4 files changed, 61 insertions(+), 3 deletions(-)
>
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
> index 8dc60e9388..3fbcb6ca8f 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -4793,6 +4793,55 @@ static cmdline_parse_inst_t cmd_csum_tunnel = {
>   	},
>   };
>   
> +struct cmd_csum_mac_swap_result {
> +	cmdline_fixed_string_t csum;
> +	cmdline_fixed_string_t parse;
> +	cmdline_fixed_string_t onoff;
> +	portid_t port_id;
> +};
> +
> +static void
> +cmd_csum_mac_swap_parsed(void *parsed_result,
> +		       __rte_unused struct cmdline *cl,
> +		       __rte_unused void *data)
> +{
> +	struct cmd_csum_mac_swap_result *res = parsed_result;
> +
> +	if (port_id_is_invalid(res->port_id, ENABLED_WARN))
> +		return;
> +	if (strcmp(res->onoff, "on") == 0)
> +		ports[res->port_id].fwd_mac_swap = 1;
> +	else
> +		ports[res->port_id].fwd_mac_swap = 0;
> +}
> +
> +static cmdline_parse_token_string_t cmd_csum_mac_swap_csum =
> +	TOKEN_STRING_INITIALIZER(struct cmd_csum_mac_swap_result,
> +				 csum, "csum");
> +static cmdline_parse_token_string_t cmd_csum_mac_swap_parse =
> +	TOKEN_STRING_INITIALIZER(struct cmd_csum_mac_swap_result,
> +				 parse, "mac-swap");
> +static cmdline_parse_token_string_t cmd_csum_mac_swap_onoff =
> +	TOKEN_STRING_INITIALIZER(struct cmd_csum_mac_swap_result,
> +				 onoff, "on#off");
> +static cmdline_parse_token_num_t cmd_csum_mac_swap_portid =
> +	TOKEN_NUM_INITIALIZER(struct cmd_csum_mac_swap_result,
> +			      port_id, RTE_UINT16);
> +
> +static cmdline_parse_inst_t cmd_csum_mac_swap = {
> +	.f = cmd_csum_mac_swap_parsed,
> +	.data = NULL,
> +	.help_str = "csum mac-swap on|off <port_id>: "
> +		    "Enable/Disable forward mac address swap",
> +	.tokens = {
> +		(void *)&cmd_csum_mac_swap_csum,
> +		(void *)&cmd_csum_mac_swap_parse,
> +		(void *)&cmd_csum_mac_swap_onoff,
> +		(void *)&cmd_csum_mac_swap_portid,
> +		NULL,
> +	},
> +};
> +
>   /* *** ENABLE HARDWARE SEGMENTATION IN TX NON-TUNNELED PACKETS *** */
>   struct cmd_tso_set_result {
>   	cmdline_fixed_string_t tso;
> @@ -12628,6 +12677,7 @@ static cmdline_parse_ctx_t builtin_ctx[] = {
>   	(cmdline_parse_inst_t *)&cmd_csum_set,
>   	(cmdline_parse_inst_t *)&cmd_csum_show,
>   	(cmdline_parse_inst_t *)&cmd_csum_tunnel,
> +	(cmdline_parse_inst_t *)&cmd_csum_mac_swap,
>   	(cmdline_parse_inst_t *)&cmd_tso_set,
>   	(cmdline_parse_inst_t *)&cmd_tso_show,
>   	(cmdline_parse_inst_t *)&cmd_tunnel_tso_set,
> diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
> index 144f28819c..1c24598515 100644
> --- a/app/test-pmd/csumonly.c
> +++ b/app/test-pmd/csumonly.c
> @@ -915,6 +915,12 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
>   		 * and inner headers */
>   
>   		eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
> +		if (ports[fs->tx_port].fwd_mac_swap) {
> +			rte_ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
> +					    &eth_hdr->dst_addr);
> +			rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
> +					    &eth_hdr->src_addr);
> +		}
>   		parse_ethernet(eth_hdr, &info);
>   		l3_hdr = (char *)eth_hdr + info.l2_len;
>   
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> index 97adafacd0..a61142bd32 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -4218,10 +4218,11 @@ init_port(void)
>   				"rte_zmalloc(%d struct rte_port) failed\n",
>   				RTE_MAX_ETHPORTS);
>   	}
> -	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
> +	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
> +		ports[i].fwd_mac_swap = 1;
>   		ports[i].xstats_info.allocated = false;
> -	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
>   		LIST_INIT(&ports[i].flow_tunnel_list);
> +	}
>   	/* Initialize ports NUMA structures */
>   	memset(port_numa, NUMA_NO_CONFIG, RTE_MAX_ETHPORTS);
>   	memset(rxring_numa, NUMA_NO_CONFIG, RTE_MAX_ETHPORTS);
> diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
> index 7fef96f9b1..9182bad26c 100644
> --- a/app/test-pmd/testpmd.h
> +++ b/app/test-pmd/testpmd.h
> @@ -316,7 +316,8 @@ struct rte_port {
>   	queueid_t               queue_nb; /**< nb. of queues for flow rules */
>   	uint32_t                queue_sz; /**< size of a queue for flow rules */
>   	uint8_t                 slave_flag : 1, /**< bonding slave port */
> -				bond_flag : 1; /**< port is bond device */
> +				bond_flag : 1, /**< port is bond device */
> +				fwd_mac_swap : 1; /**< swap packet MAC before forward */
>   	struct port_template    *pattern_templ_list; /**< Pattern templates. */
>   	struct port_template    *actions_templ_list; /**< Actions templates. */
>   	struct port_table       *table_list; /**< Flow tables. */
Acked-by: Huisong Li <lihuisong@huawei.com>