[EXT] Re: [PATCH v11 1/1] app/testpmd: support multiple mbuf pools per Rx queue

[Hanumanth Reddy Pothula]

> -----Original Message-----
> From: Singh, Aman Deep <aman.deep.singh at intel.com>
> Sent: Thursday, November 3, 2022 5:46 PM
> To: Hanumanth Reddy Pothula <hpothula at marvell.com>; Yuying Zhang
> <yuying.zhang at intel.com>
> Cc: dev at dpdk.org; andrew.rybchenko at oktetlabs.ru; thomas at monjalon.net;
> Jerin Jacob Kollanukkaran <jerinj at marvell.com>; Nithin Kumar Dabilpuram
> <ndabilpuram at marvell.com>
> Subject: [EXT] Re: [PATCH v11 1/1] app/testpmd: support multiple mbuf pools
> per Rx queue
> 
> External Email
> 
> ----------------------------------------------------------------------
> 
> 
> On 10/25/2022 7:10 AM, Hanumanth Pothula wrote:
> > Some of the HW has support for choosing memory pools based on the
> > packet's size. The pool sort capability allows PMD/NIC to choose a
> > memory pool based on the packet's length.
> >
> > On multiple mempool support enabled, populate mempool array
> > accordingly. Also, print pool name on which packet is received.
> >
> > Signed-off-by: Hanumanth Pothula <hpothula at marvell.com>
> > v11:
> >   - Resolve compilation and warning.
> > v10:
> >   - Populate multi-mempool array based on mbuf_data_size_n instead
> >     of rx_pkt_nb_segs.
> > ---
> >   app/test-pmd/testpmd.c | 63 +++++++++++++++++++++++++++---------------
> >   app/test-pmd/testpmd.h |  3 ++
> >   app/test-pmd/util.c    |  4 +--
> >   3 files changed, 45 insertions(+), 25 deletions(-)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > 5b0f0838dc..62f7c9dba8 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -2647,11 +2647,18 @@ rx_queue_setup(uint16_t port_id, uint16_t
> rx_queue_id,
> >   	       struct rte_eth_rxconf *rx_conf, struct rte_mempool *mp)
> >   {
> >   	union rte_eth_rxseg rx_useg[MAX_SEGS_BUFFER_SPLIT] = {};
> > +	struct rte_mempool *rx_mempool[MAX_MEMPOOL] = {};
> > +	struct rte_mempool *mpx;
> >   	unsigned int i, mp_n;
> >   	int ret;
> >
> > -	if (rx_pkt_nb_segs <= 1 ||
> > -	    (rx_conf->offloads & RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT) == 0) {
> > +	/* Verify Rx queue configuration is single pool and segment or
> > +	 * multiple pool/segment.
> > +	 * @see rte_eth_rxconf::rx_mempools
> > +	 * @see rte_eth_rxconf::rx_seg
> > +	 */
> > +	if (!(mbuf_data_size_n > 1) && !(rx_pkt_nb_segs > 1 ||
> > +	    ((rx_conf->offloads & RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT) != 0))) {
> >   		rx_conf->rx_seg = NULL;
> >   		rx_conf->rx_nseg = 0;
> >   		ret = rte_eth_rx_queue_setup(port_id, rx_queue_id, @@ -
> 2659,29
> > +2666,39 @@ rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
> >   					     rx_conf, mp);
> >   		goto exit;
> >   	}
> > -	for (i = 0; i < rx_pkt_nb_segs; i++) {
> > -		struct rte_eth_rxseg_split *rx_seg = &rx_useg[i].split;
> > -		struct rte_mempool *mpx;
> > -		/*
> > -		 * Use last valid pool for the segments with number
> > -		 * exceeding the pool index.
> > -		 */
> > -		mp_n = (i >= mbuf_data_size_n) ? mbuf_data_size_n - 1 : i;
> > -		mpx = mbuf_pool_find(socket_id, mp_n);
> > -		/* Handle zero as mbuf data buffer size. */
> > -		rx_seg->offset = i < rx_pkt_nb_offs ?
> > -				   rx_pkt_seg_offsets[i] : 0;
> > -		rx_seg->mp = mpx ? mpx : mp;
> > -		if (rx_pkt_hdr_protos[i] != 0 && rx_pkt_seg_lengths[i] == 0) {
> > -			rx_seg->proto_hdr = rx_pkt_hdr_protos[i];
> > -		} else {
> > -			rx_seg->length = rx_pkt_seg_lengths[i] ?
> > -					rx_pkt_seg_lengths[i] :
> > -					mbuf_data_size[mp_n];
> > +	if (rx_conf->offloads & RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT) {
> 
> In case this flag *_OFFLOAD_BUFFER_SPLIT is not set, but rx_pkt_nb_segs > 1
> Will it still enter below loop, as before.

Yes Aman, RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT flag to be set to proceed further.
Do you suggest to enter the loop on  rx_pkt_nb_segs > 1 irrespective of RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT flag. 
Something like, 
if (rx_pkt_nb_segs > 1) {
	for(i = 0; i < rx_pkt_nb_segs; i++){
	}
}

> 
> > +		for (i = 0; i < rx_pkt_nb_segs; i++) {
> > +			struct rte_eth_rxseg_split *rx_seg = &rx_useg[i].split;
> > +			/*
> > +			 * Use last valid pool for the segments with number
> > +			 * exceeding the pool index.
> > +			 */
> > +			mp_n = (i > mbuf_data_size_n) ? mbuf_data_size_n - 1 :
> i;
> > +			mpx = mbuf_pool_find(socket_id, mp_n);
> > +			if (rx_conf->offloads &
> RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT) {
> 
> Isn't above check already found to be TRUE, before we reached here.
Yes this is redundant, will remove.
> 
> > +				/**
> > +				 * On Segment length zero, update length as,
> > +				 *      buffer size - headroom size
> > +				 * to make sure enough space is accomidate for
> header.
> > +				 */
> > +				rx_seg->length = rx_pkt_seg_lengths[i] ?
> > +						 rx_pkt_seg_lengths[i] :
> > +						 mbuf_data_size[mp_n] -
> RTE_PKTMBUF_HEADROOM;
> > +				rx_seg->offset = i < rx_pkt_nb_offs ?
> > +						 rx_pkt_seg_offsets[i] : 0;
> > +				rx_seg->mp = mpx ? mpx : mp;
> > +			}
> > +		}
> > +		rx_conf->rx_nseg = rx_pkt_nb_segs;
> > +		rx_conf->rx_seg = rx_useg;
> > +	} else {
> > +		for (i = 0; i < mbuf_data_size_n; i++) {
> > +			mpx = mbuf_pool_find(socket_id, i);
> > +			rx_mempool[i] = mpx ? mpx : mp;
> >   		}
> > +		rx_conf->rx_mempools = rx_mempool;
> > +		rx_conf->rx_nmempool = mbuf_data_size_n;
> >   	}
> > -	rx_conf->rx_nseg = rx_pkt_nb_segs;
> > -	rx_conf->rx_seg = rx_useg;
> >   	ret = rte_eth_rx_queue_setup(port_id, rx_queue_id, nb_rx_desc,
> >   				    socket_id, rx_conf, NULL);
> >   	rx_conf->rx_seg = NULL;
> > diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h index
> > e65be323b8..14be10dcef 100644
> > --- a/app/test-pmd/testpmd.h
> > +++ b/app/test-pmd/testpmd.h
> > @@ -80,6 +80,9 @@ extern uint8_t cl_quit;
> >
> >   #define MIN_TOTAL_NUM_MBUFS 1024
> >
> > +/* Maximum number of pools supported per Rx queue */ #define
> > +MAX_MEMPOOL 8
> > +
> >   typedef uint8_t  lcoreid_t;
> >   typedef uint16_t portid_t;
> >   typedef uint16_t queueid_t;
> > diff --git a/app/test-pmd/util.c b/app/test-pmd/util.c index
> > fd98e8b51d..f9df5f69ef 100644
> > --- a/app/test-pmd/util.c
> > +++ b/app/test-pmd/util.c
> > @@ -150,8 +150,8 @@ dump_pkt_burst(uint16_t port_id, uint16_t queue,
> struct rte_mbuf *pkts[],
> >   		print_ether_addr(" - dst=", &eth_hdr->dst_addr,
> >   				 print_buf, buf_size, &cur_len);
> >   		MKDUMPSTR(print_buf, buf_size, cur_len,
> > -			  " - type=0x%04x - length=%u - nb_segs=%d",
> > -			  eth_type, (unsigned int) mb->pkt_len,
> > +			  " - pool=%s - type=0x%04x - length=%u -
> nb_segs=%d",
> > +			  mb->pool->name, eth_type, (unsigned int) mb-
> >pkt_len,
> >   			  (int)mb->nb_segs);
> >   		ol_flags = mb->ol_flags;
> >   		if (ol_flags & RTE_MBUF_F_RX_RSS_HASH) {