[dpdk-stable] patch 'net/pcap: fix Rx with small buffers' has been queued to LTS release 18.11.3

[Kevin Traynor]

Hi,

FYI, your patch has been queued to LTS release 18.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 09/12/19. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable-queue/commit/11ab8ddd3f846ae5d87f3ad40b7934388a071829

Thanks.

Kevin Traynor

---
>From 11ab8ddd3f846ae5d87f3ad40b7934388a071829 Mon Sep 17 00:00:00 2001
From: David Marchand <david.marchand at redhat.com>
Date: Thu, 25 Jul 2019 21:24:17 +0200
Subject: [PATCH] net/pcap: fix Rx with small buffers

[ upstream commit 6653d812c6d47f02ec6562a6118254299b0ffd5c ]

If the pkt pool contains only buffers smaller than the default headroom,
then the driver will compute an invalid buffer size (negative value cast
to an uint16_t).
Rely on the mbuf api to check how much space is available in the mbuf.

Fixes: 6eb0ae218a98 ("pcap: fix mbuf allocation")

Signed-off-by: David Marchand <david.marchand at redhat.com>
Acked-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
 drivers/net/pcap/rte_eth_pcap.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c
index 070124c86..334075ca8 100644
--- a/drivers/net/pcap/rte_eth_pcap.c
+++ b/drivers/net/pcap/rte_eth_pcap.c
@@ -189,5 +189,4 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	struct pcap_rx_queue *pcap_q = queue;
 	uint16_t num_rx = 0;
-	uint16_t buf_size;
 	uint32_t rx_bytes = 0;
 	pcap_t *pcap;
@@ -212,9 +211,5 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 			break;
 
-		/* Now get the space available for data in the mbuf */
-		buf_size = rte_pktmbuf_data_room_size(pcap_q->mb_pool) -
-				RTE_PKTMBUF_HEADROOM;
-
-		if (header.caplen <= buf_size) {
+		if (header.caplen <= rte_pktmbuf_tailroom(mbuf)) {
 			/* pcap packet will fit in the mbuf, can copy it */
 			rte_memcpy(rte_pktmbuf_mtod(mbuf, void *), packet,
-- 
2.20.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2019-09-05 10:36:48.245734501 +0100
+++ 0012-net-pcap-fix-Rx-with-small-buffers.patch	2019-09-05 10:36:47.480701240 +0100
@@ -1 +1 @@
-From 6653d812c6d47f02ec6562a6118254299b0ffd5c Mon Sep 17 00:00:00 2001
+From 11ab8ddd3f846ae5d87f3ad40b7934388a071829 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 6653d812c6d47f02ec6562a6118254299b0ffd5c ]
+
@@ -12 +13,0 @@
-Cc: stable at dpdk.org
@@ -21 +22 @@
-index 322c18f75..470867de6 100644
+index 070124c86..334075ca8 100644
@@ -24 +25 @@
-@@ -243,5 +243,4 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+@@ -189,5 +189,4 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
@@ -30 +31 @@
-@@ -266,9 +265,5 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
+@@ -212,9 +211,5 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)