Re: [PATCH v5 3/3] app/testpmd: enable TCP/IPv4 GRO

[Jiayu Hu <jiayu.hu@intel.com>]

On Mon, Jun 19, 2017 at 10:27:05AM +0800, Wu, Jingjing wrote:
> 
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jiayu Hu
> > Sent: Sunday, June 18, 2017 3:21 PM
> > To: dev@dpdk.org
> > Cc: Ananyev, Konstantin <konstantin.ananyev@intel.com>; yliu@fridaylinux.org;
> > Wiles, Keith <keith.wiles@intel.com>; Tan, Jianfeng <jianfeng.tan@intel.com>;
> > Bie, Tiwei <tiwei.bie@intel.com>; Yao, Lei A <lei.a.yao@intel.com>; Hu, Jiayu
> > <jiayu.hu@intel.com>
> > Subject: [dpdk-dev] [PATCH v5 3/3] app/testpmd: enable TCP/IPv4 GRO
> > 
> > This patch demonstrates the usage of GRO library in testpmd. By default, GRO
> > is turned off. Command, "gro on (port_id)", turns on GRO for the given port;
> > command, "gro off (port_id)", turns off GRO for the given port. Currently, GRO
> > only supports to process TCP/IPv4 packets and works in IO forward mode.
> > Besides, only GRO lightweight mode is enabled.
> > 
> > Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
> > ---
> >  app/test-pmd/cmdline.c | 45
> > +++++++++++++++++++++++++++++++++++++++++++++
> >  app/test-pmd/config.c  | 29 +++++++++++++++++++++++++++++
> >  app/test-pmd/iofwd.c   |  6 ++++++
> >  app/test-pmd/testpmd.c |  3 +++
> >  app/test-pmd/testpmd.h | 11 +++++++++++
> >  5 files changed, 94 insertions(+)
> > 
> > diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index
> > 105c71f..d1ca8df 100644
> > --- a/app/test-pmd/cmdline.c
> > +++ b/app/test-pmd/cmdline.c
> > @@ -76,6 +76,7 @@
> >  #include <rte_devargs.h>
> >  #include <rte_eth_ctrl.h>
> >  #include <rte_flow.h>
> > +#include <rte_gro.h>
> > 
> >  #include <cmdline_rdline.h>
> >  #include <cmdline_parse.h>
> > @@ -423,6 +424,9 @@ static void cmd_help_long_parsed(void *parsed_result,
> >  			"tso show (portid)"
> >  			"    Display the status of TCP Segmentation
> > Offload.\n\n"
> > 
> > +			"gro (on|off) (port_id)"
> > +			"    Enable or disable Generic Receive Offload.\n\n"
> > +
> >  			"set fwd (%s)\n"
> >  			"    Set packet forwarding mode.\n\n"
> > 
> > @@ -3831,6 +3835,46 @@ cmdline_parse_inst_t cmd_tunnel_tso_show = {
> >  	},
> >  };
> > 
> > +/* *** SET GRO FOR A PORT *** */
> > +struct cmd_gro_result {
> > +	cmdline_fixed_string_t cmd_keyword;
> > +	cmdline_fixed_string_t mode;
> > +	uint8_t port_id;
> > +};
> > +
> > +static void
> > +cmd_set_gro_parsed(void *parsed_result,
> > +		__attribute__((unused)) struct cmdline *cl,
> > +		__attribute__((unused)) void *data)
> > +{
> > +	struct cmd_gro_result *res;
> > +
> > +	res = parsed_result;
> > +	setup_gro(res->mode, res->port_id);
> > +}
> > +
> > +cmdline_parse_token_string_t cmd_gro_keyword =
> > +	TOKEN_STRING_INITIALIZER(struct cmd_gro_result,
> > +			cmd_keyword, "gro");
> > +cmdline_parse_token_string_t cmd_gro_mode =
> > +	TOKEN_STRING_INITIALIZER(struct cmd_gro_result,
> > +			mode, "on#off");
> > +cmdline_parse_token_num_t cmd_gro_pid =
> > +	TOKEN_NUM_INITIALIZER(struct cmd_gro_result,
> > +			port_id, UINT8);
> > +
> > +cmdline_parse_inst_t cmd_set_gro = {
> > +	.f = cmd_set_gro_parsed,
> > +	.data = NULL,
> > +	.help_str = "gro (on|off) (port_id)",
> > +	.tokens = {
> > +		(void *)&cmd_gro_keyword,
> > +		(void *)&cmd_gro_mode,
> > +		(void *)&cmd_gro_pid,
> > +		NULL,
> > +	},
> > +};
> > +
> >  /* *** ENABLE/DISABLE FLUSH ON RX STREAMS *** */  struct
> > cmd_set_flush_rx {
> >  	cmdline_fixed_string_t set;
> > @@ -13710,6 +13754,7 @@ cmdline_parse_ctx_t main_ctx[] = {
> >  	(cmdline_parse_inst_t *)&cmd_tso_show,
> >  	(cmdline_parse_inst_t *)&cmd_tunnel_tso_set,
> >  	(cmdline_parse_inst_t *)&cmd_tunnel_tso_show,
> > +	(cmdline_parse_inst_t *)&cmd_set_gro,
> >  	(cmdline_parse_inst_t *)&cmd_link_flow_control_set,
> >  	(cmdline_parse_inst_t *)&cmd_link_flow_control_set_rx,
> >  	(cmdline_parse_inst_t *)&cmd_link_flow_control_set_tx, diff --git
> > a/app/test-pmd/config.c b/app/test-pmd/config.c index 3cd4f31..858342d
> > 100644
> > --- a/app/test-pmd/config.c
> > +++ b/app/test-pmd/config.c
> > @@ -71,6 +71,7 @@
> >  #ifdef RTE_LIBRTE_BNXT_PMD
> >  #include <rte_pmd_bnxt.h>
> >  #endif
> > +#include <rte_gro.h>
> > 
> >  #include "testpmd.h"
> > 
> > @@ -2414,6 +2415,34 @@ set_tx_pkt_segments(unsigned *seg_lengths,
> > unsigned nb_segs)
> >  	tx_pkt_nb_segs = (uint8_t) nb_segs;
> >  }
> > 
> > +void
> > +setup_gro(const char *mode, uint8_t port_id) {
> > +	if (!rte_eth_dev_is_valid_port(port_id)) {
> > +		printf("invalid port id %u\n", port_id);
> > +		return;
> > +	}
> > +	if (strcmp(mode, "on") == 0) {
> > +		if (test_done == 0) {
> > +			printf("before enable GRO,"
> > +					" please stop forwarding first\n");
> > +			return;
> > +		}
> > +		gro_ports[port_id].enable = 1;
> > +		gro_ports[port_id].param.max_flow_num = 4;
> > +		gro_ports[port_id].param.max_item_per_flow = 32;
> Is 4 and 32 the default value for GRO? If so, how about to define the MACRO in rte_gro.h

The values of param.max_flow_num and param.max_item_per_flow should
depend on the specific usage scenarios. In testpmd case, the number
of packets returned by rte_eth_rx_burst each time is always less
than or equal to 32. So I simply hard-code this value. Besides, I
assume the flow number per queue receives is less than 4. So does
the value of param.max_flow_num. Maybe I should add commands in
testpmd to enable users to set these two values dynamically. How
do you think?

> 
> > +		gro_ports[port_id].param.desired_gro_types = GRO_TCP_IPV4;
> > +		gro_ports[port_id].param.max_packet_size = UINT16_MAX;
> > +	} else if (strcmp(mode, "off") == 0) {
> 
> "else" is enough, no need to compare it with "off".

Thanks. I will modify it in next patch.

> 
> > +		if (test_done == 0) {
> > +			printf("before disable GRO,"
> > +					" please stop forwarding first\n");
> > +			return;
> > +		}
> 
> How about to move the test_done before the mode checking?

Thanks. I will modify it in next patch.

> 
> > +		gro_ports[port_id].enable = 0;
> > +	}
> > +}
> > +
> >  char*
> >  list_pkt_forwarding_modes(void)
> >  {
> > diff --git a/app/test-pmd/iofwd.c b/app/test-pmd/iofwd.c index
> > 15cb4a2..d9ec528 100644
> > --- a/app/test-pmd/iofwd.c
> > +++ b/app/test-pmd/iofwd.c
> > @@ -65,6 +65,7 @@
> >  #include <rte_ethdev.h>
> >  #include <rte_string_fns.h>
> >  #include <rte_flow.h>
> > +#include <rte_gro.h>
> > 
> >  #include "testpmd.h"
> > 
> > @@ -99,6 +100,11 @@ pkt_burst_io_forward(struct fwd_stream *fs)
> >  			pkts_burst, nb_pkt_per_burst);
> >  	if (unlikely(nb_rx == 0))
> >  		return;
> > +	if (unlikely(gro_ports[fs->rx_port].enable)) {
> > +		nb_rx = rte_gro_reassemble_burst(pkts_burst,
> > +				nb_rx,
> > +				gro_ports[fs->rx_port].param);
> > +	}
> >  	fs->rx_packets += nb_rx;
> > 
> >  #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > b29328a..ed27c7a 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -90,6 +90,7 @@
> >  #ifdef RTE_LIBRTE_LATENCY_STATS
> >  #include <rte_latencystats.h>
> >  #endif
> > +#include <rte_gro.h>
> > 
> >  #include "testpmd.h"
> > 
> > @@ -378,6 +379,8 @@ lcoreid_t bitrate_lcore_id;  uint8_t bitrate_enabled;
> > #endif
> > 
> > +struct gro_status gro_ports[RTE_MAX_ETHPORTS];
> > +
> >  /* Forward function declarations */
> >  static void map_port_queue_stats_mapping_registers(uint8_t pi, struct
> > rte_port *port);  static void check_all_ports_link_status(uint32_t port_mask);
> > diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h index
> > 364502d..0471e99 100644
> > --- a/app/test-pmd/testpmd.h
> > +++ b/app/test-pmd/testpmd.h
> > @@ -34,6 +34,8 @@
> >  #ifndef _TESTPMD_H_
> >  #define _TESTPMD_H_
> > 
> > +#include <rte_gro.h>
> > +
> >  #define RTE_PORT_ALL            (~(portid_t)0x0)
> > 
> >  #define RTE_TEST_RX_DESC_MAX    2048
> > @@ -109,6 +111,8 @@ struct fwd_stream {
> >  	queueid_t  tx_queue;  /**< TX queue to send forwarded packets */
> >  	streamid_t peer_addr; /**< index of peer ethernet address of packets
> > */
> > 
> > +	uint16_t tbl_idx;	/**< TCP IPv4 GRO lookup tale index */
> > +
> >  	unsigned int retry_enabled;
> > 
> >  	/* "read-write" results */
> > @@ -428,6 +432,12 @@ extern struct ether_addr
> > peer_eth_addrs[RTE_MAX_ETHPORTS];  extern uint32_t burst_tx_delay_time;
> > /**< Burst tx delay time(us) for mac-retry. */  extern uint32_t
> > burst_tx_retry_num;  /**< Burst tx retry number for mac-retry. */
> > 
> > +struct gro_status {
> > +	struct rte_gro_param param;
> > +	uint8_t enable;
> > +};
> > +extern struct gro_status gro_ports[RTE_MAX_ETHPORTS];
> > +
> >  static inline unsigned int
> >  lcore_num(void)
> >  {
> > @@ -626,6 +636,7 @@ void get_2tuple_filter(uint8_t port_id, uint16_t index);
> > void get_5tuple_filter(uint8_t port_id, uint16_t index);  int
> > rx_queue_id_is_invalid(queueid_t rxq_id);  int
> > tx_queue_id_is_invalid(queueid_t txq_id);
> > +void setup_gro(const char *mode, uint8_t port_id);
> > 
> >  /* Functions to manage the set of filtered Multicast MAC addresses */  void
> > mcast_addr_add(uint8_t port_id, struct ether_addr *mc_addr);
> > --
> > 2.7.4
> 
> Looks fine to me, just don't forget the doc update "doc/guides/testpmd_app_ug/" due to new command line

Thanks for you comments. I will update it.

BRs,
Jiayu