From: Stephen Hemminger <stephen@networkplumber.org>
To: Ferruh Yigit <ferruh.yigit@amd.com>
Cc: dev@dpdk.org
Subject: Re: [PATCH v12 11/12] net/tap: do not mark queue full as error
Date: Tue, 21 May 2024 08:46:48 -0700 [thread overview]
Message-ID: <20240521084648.2ef78531@hermes.local> (raw)
In-Reply-To: <96d648dc-94ac-45bc-8398-0759083d4ca1@amd.com>
On Mon, 20 May 2024 18:52:27 +0100
Ferruh Yigit <ferruh.yigit@amd.com> wrote:
> On 5/2/2024 10:31 PM, Stephen Hemminger wrote:
> > If tap device in kernel returns EAGAIN that means it is full.
> > That is not an error.
> >
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> > drivers/net/tap/rte_eth_tap.c | 13 ++++++++-----
> > 1 file changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> > index 2484a82ccb..485bd35912 100644
> > --- a/drivers/net/tap/rte_eth_tap.c
> > +++ b/drivers/net/tap/rte_eth_tap.c
> > @@ -542,7 +542,6 @@ tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
> > struct rte_mbuf *seg = mbuf;
> > uint64_t l4_ol_flags;
> > int proto;
> > - int n;
> > int j;
> > int k; /* current index in iovecs for copying segments */
> >
> > @@ -647,14 +646,18 @@ tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
> > }
> >
> > /* copy the tx frame data */
> > - n = writev(process_private->fds[txq->queue_id], iovecs, k);
> > - if (n <= 0)
> > - return -1;
> > + if (unlikely(writev(process_private->fds[txq->queue_id], iovecs, k) < 0)) {
> > + TAP_LOG(DEBUG, "writev (qid=%u fd=%d) %s",
> > + txq->queue_id, process_private->fds[txq->queue_id],
> > + strerror(errno));
> >
>
> Do we really want logging in datapath?
>
> > + return (errno == EAGAIN) ? 0 : -1;
> >
>
> Nack.
>
> Returning '0' will cause 'pmd_tx_burst()' to continue and increase
> 'num_tx', this will mislead as packet sent successfully.
>
> We should have three return values from 'tap_write_mbufs()':
> <0 -> Error, 'pmd_tx_burst()' should break, stats.errors updated.
> 0 -> 'pmd_tx_burst()' should break, valid num_tx returned
> >0 -> 'pmd_tx_burst()' work as it is.
>
> > + }
> >
> > (*num_packets)++;
> > (*num_tx_bytes) += rte_pktmbuf_pkt_len(mbuf);
> > }
> > - return 0;
> > +
> > + return 1;
> >
>
> Why '1', wouldn't it be better to return number of packets written
> successfully.
>
Decided to drop this patch. Doing GSO inside the TAP device is the
wrong place to do it. Kernel already has API to do GSO and checksum
offload and it will be simpler and faster to use that. When TAP
device is updated not to do the GSO here, this code goes away
and handling the full condition properly gets much easier.
When TAP is doing GSO there are lots of corner cases where a expanded
GSO packet could get only partially sent.
next prev parent reply other threads:[~2024-05-21 15:46 UTC|newest]
Thread overview: 206+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-30 3:46 [RFC 0/2] net/tap RSS BPF rewrite Stephen Hemminger
2024-01-30 3:46 ` [RFC 1/2] tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-01-30 3:46 ` [RFC 2/2] tap: rework BPF handling Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 0/7] net/tap: RSS using BPF overhaul Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 1/7] net/tap: remove unused RSS hash types Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 2/7] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 3/7] net/tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 4/7] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 5/7] net/tap: use libbpf to load new " Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 6/7] net/tap: remove no longer used files Stephen Hemminger
2024-02-07 22:11 ` [PATCH v2 7/7] MAINTAINERS: add maintainer for TAP device Stephen Hemminger
2024-02-08 7:01 ` Morten Brørup
2024-02-08 17:41 ` [PATCH v3 0/7] net/tap: RSS using BPF overhaul Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 1/7] net/tap: remove unused RSS hash types Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 2/7] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 3/7] tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 4/7] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 5/7] net/tap: use libbpf to load new " Stephen Hemminger
2024-02-08 18:02 ` Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 6/7] net/tap: remove no longer used files Stephen Hemminger
2024-02-08 17:41 ` [PATCH v3 7/7] MAINTAINERS: add maintainer for TAP device Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 0/7] net/tap: queue flow action RSS using BPF redo Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 1/7] net/tap: remove unused RSS hash types Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 2/7] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 3/7] tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 4/7] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-02-10 0:54 ` Ferruh Yigit
2024-02-10 2:09 ` Stephen Hemminger
2024-02-28 17:27 ` Ferruh Yigit
2024-02-29 23:39 ` Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 5/7] net/tap: use libbpf to load new " Stephen Hemminger
2024-02-08 20:39 ` Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 6/7] net/tap: remove no longer used files Stephen Hemminger
2024-02-08 19:05 ` [PATCH v4 7/7] MAINTAINERS: add maintainer for TAP device Stephen Hemminger
2024-02-12 16:47 ` [PATCH v4 0/7] net/tap: queue flow action RSS using BPF redo Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 0/8] net/tap: cleanups and fix BPF flow Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 1/8] net/tap: do not duplicate fd's Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 2/8] doc: fix the requirements and building of TAP flow Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 3/8] net/tap: remove unused RSS hash types Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 4/8] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 5/8] net/tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 6/8] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-04-02 17:12 ` [PATCH v5 7/8] net/tap: use libbpf to load new " Stephen Hemminger
2024-04-03 11:50 ` Luca Boccassi
2024-04-03 14:53 ` Stephen Hemminger
2024-04-03 15:55 ` Stephen Hemminger
2024-04-03 21:19 ` Luca Boccassi
2024-04-03 23:41 ` Stephen Hemminger
2024-04-04 0:49 ` Luca Boccassi
2024-04-04 15:51 ` Stephen Hemminger
2024-04-04 16:12 ` Luca Boccassi
2024-04-04 15:30 ` Stephen Hemminger
2024-04-04 16:11 ` Luca Boccassi
2024-04-02 17:12 ` [PATCH v5 8/8] net/tap: remove no longer used files Stephen Hemminger
2024-04-02 20:43 ` Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 0/8] net/tap: cleanup and fix BPF flow support Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 1/8] net/tap: do not duplicate fd's Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 2/8] doc: fix the requirements and building of TAP flow Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 3/8] net/tap: remove unused fields Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 4/8] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 5/8] net/tap: stop "vendoring" linux bpf headers Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 6/8] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-04-05 21:14 ` [PATCH v6 7/8] net/tap: use libbpf to load new " Stephen Hemminger
2024-04-05 21:15 ` [PATCH v6 8/8] net/tap: remove no longer used files Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 0/8] net/tap: cleanups and fix BPF support Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 1/8] net/tap: do not duplicate fd's Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 2/8] net/tap: remove unused fields Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 3/8] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 4/8] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 5/8] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 6/8] net/tap: use libbpf to load new " Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 7/8] net/tap: remove no longer used files Stephen Hemminger
2024-04-08 21:18 ` [PATCH v7 8/8] doc: update documentation of TAP PMD Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 0/8] net/tap: cleanups and fix BPF support Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 1/8] net/tap: do not duplicate fd's Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 2/8] net/tap: remove unused fields Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 3/8] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 4/8] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 5/8] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 6/8] net/tap: use libbpf to load new " Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 7/8] net/tap: remove no longer used files Stephen Hemminger
2024-04-09 3:40 ` [PATCH v8 8/8] doc: update documentation of TAP PMD Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 0/9] net/tap: fix RSS (BPF) support Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 1/9] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-01 11:13 ` Ferruh Yigit
2024-05-01 23:53 ` Stephen Hemminger
2024-05-02 14:51 ` Ferruh Yigit
2024-05-02 16:22 ` Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 2/9] net/tap: remove unused fields Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 3/9] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 4/9] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 5/9] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-01 11:14 ` Ferruh Yigit
2024-04-26 15:48 ` [PATCH v9 6/9] net/tap: use libbpf to load new " Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 7/9] net/tap: remove no longer used files Stephen Hemminger
2024-04-26 15:48 ` [PATCH v9 8/9] doc: update documentation of TAP PMD Stephen Hemminger
2024-05-01 12:36 ` Ferruh Yigit
2024-04-26 15:48 ` [PATCH v9 9/9] net/tap: simplify the internal structure Stephen Hemminger
2024-05-01 11:18 ` [PATCH v9 0/9] net/tap: fix RSS (BPF) support Ferruh Yigit
2024-05-01 15:41 ` Stephen Hemminger
2024-05-01 16:11 ` [PATCH v10 0/9] net/tap: fix RSS (BPF) flow support Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 1/9] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 2/9] net/tap: remove unused fields Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 3/9] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 4/9] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 5/9] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 6/9] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 7/9] net/tap: remove no longer used files Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 8/9] net/tap: simplify internals Stephen Hemminger
2024-05-01 16:12 ` [PATCH v10 9/9] net/tap: update documentation Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 0/9] net/tap fix RSS (BPF) flow support Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 1/9] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 2/9] net/tap: remove unused fields Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 3/9] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 4/9] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 5/9] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 6/9] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 7/9] net/tap: remove no longer used files Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 8/9] net/tap: simplify internals Stephen Hemminger
2024-05-02 2:49 ` [PATCH v11 9/9] net/tap: update documentation Stephen Hemminger
2024-05-02 21:31 ` [PATCH v12 00/12] net/tap: RSS and other fixes Stephen Hemminger
2024-05-02 21:31 ` [PATCH v12 01/12] net/tap: fix fd check in flow_isolate Stephen Hemminger
2024-05-20 17:46 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 02/12] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-20 17:46 ` Ferruh Yigit
2024-05-20 18:16 ` Stephen Hemminger
2024-05-02 21:31 ` [PATCH v12 03/12] net/tap: remove unused fields Stephen Hemminger
2024-05-20 17:46 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 04/12] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-20 17:47 ` Ferruh Yigit
2024-05-21 2:01 ` Stephen Hemminger
2024-05-21 14:17 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 05/12] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-20 17:47 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 06/12] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-02 21:31 ` [PATCH v12 07/12] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-20 17:49 ` Ferruh Yigit
2024-05-20 18:18 ` Stephen Hemminger
2024-05-20 21:42 ` Luca Boccassi
2024-05-20 22:08 ` Ferruh Yigit
2024-05-20 22:25 ` Luca Boccassi
2024-05-20 23:20 ` Stephen Hemminger
2024-05-20 22:06 ` Ferruh Yigit
2024-05-21 4:23 ` Patrick Robb
2024-05-21 13:46 ` Ferruh Yigit
2024-05-21 14:33 ` Patrick Robb
2024-05-21 15:06 ` Aaron Conole
2024-05-21 15:41 ` Stephen Hemminger
2024-05-02 21:31 ` [PATCH v12 08/12] net/tap: remove no longer used files Stephen Hemminger
2024-05-20 17:50 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 09/12] net/tap: simplify internals Stephen Hemminger
2024-05-20 17:51 ` Ferruh Yigit
2024-05-21 15:44 ` Stephen Hemminger
2024-05-22 14:00 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 10/12] net/tap: remove extraneous newlines Stephen Hemminger
2024-05-20 17:51 ` Ferruh Yigit
2024-05-02 21:31 ` [PATCH v12 11/12] net/tap: do not mark queue full as error Stephen Hemminger
2024-05-20 17:52 ` Ferruh Yigit
2024-05-21 15:46 ` Stephen Hemminger [this message]
2024-05-02 21:31 ` [PATCH v12 12/12] net/tap: update documentation Stephen Hemminger
2024-05-20 17:53 ` Ferruh Yigit
2024-05-21 2:39 ` Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 00/11] net/tap: make RSS work again Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 01/11] net/tap: fix fd check in flow_isolate Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 02/11] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 03/11] net/tap: remove unused fields Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 04/11] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 05/11] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 06/11] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 07/11] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 08/11] net/tap: remove no longer used files Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 09/11] net/tap: simplify internals Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 10/11] net/tap: remove extraneous newlines Stephen Hemminger
2024-05-21 2:47 ` [PATCH v13 11/11] net/tap: update documentation Stephen Hemminger
2024-05-21 14:19 ` [PATCH v13 00/11] net/tap: make RSS work again Ferruh Yigit
2024-05-21 14:35 ` Ferruh Yigit
2024-05-21 14:38 ` Ferruh Yigit
2024-05-21 21:23 ` Patrick Robb
2024-05-21 21:26 ` Ferruh Yigit
2024-05-21 17:06 ` [PATCH v14 " Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 01/11] net/tap: fix fd check in flow_isolate Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 02/11] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 03/11] net/tap: remove unused fields Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 04/11] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 05/11] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 06/11] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 07/11] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 08/11] net/tap: remove no longer used files Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 09/11] net/tap: simplify internals Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 10/11] net/tap: remove extraneous newlines Stephen Hemminger
2024-05-21 17:06 ` [PATCH v14 11/11] net/tap: update documentation Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 00/11] net/tap: make RSS work again Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 01/11] net/tap: fix fd check in flow_isolate Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 02/11] net/tap: do not duplicate fd's Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 03/11] net/tap: remove unused fields Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 04/11] net/tap: validate and setup parameters for BPF RSS Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 05/11] net/tap: do not build flow support if header is out of date Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 06/11] net/tap: rewrite the RSS BPF program Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 07/11] net/tap: use libbpf to load new " Stephen Hemminger
2024-05-28 16:33 ` Cody Cheng
2024-05-21 20:12 ` [PATCH v15 08/11] net/tap: remove no longer used files Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 09/11] net/tap: simplify internals Stephen Hemminger
2024-05-22 16:15 ` Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 10/11] net/tap: remove extraneous newlines Stephen Hemminger
2024-05-21 20:12 ` [PATCH v15 11/11] net/tap: update documentation Stephen Hemminger
2024-05-22 15:42 ` [PATCH v15 00/11] net/tap: make RSS work again Ferruh Yigit
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