[PATCH 1/2] net/af_xdp: ensure xsk is deleted on Rx queue setup error

[PATCH 1/2] net/af_xdp: ensure xsk is deleted on Rx queue setup error

[Ciara Loftus]

The Rx queue setup can fail for many reasons eg. failure to setup the
custom program, failure to allocate or reserve fill queue buffers,
failure to configure busy polling etc. When a failure like one of these
occurs, if the xsk is already set up it should be deleted before
returning. This commit ensures this happens.

Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Fixes: 288a85aef192 ("net/af_xdp: enable custom XDP program loading")
Fixes: 055a393626ed ("net/af_xdp: prefer busy polling")
Fixes: 01fa83c94d7e ("net/af_xdp: workaround custom program loading")
Cc: stable@dpdk.org

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 6ac710c6bd..5f493951f6 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -1302,7 +1302,7 @@ xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 		if (ret) {
 			AF_XDP_LOG(ERR, "Failed to load custom XDP program %s\n",
 					internals->prog_path);
-			goto err;
+			goto out_umem;
 		}
 		internals->custom_prog_configured = 1;
 		cfg.libbpf_flags = XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD;
@@ -1319,7 +1319,7 @@ xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 
 	if (ret) {
 		AF_XDP_LOG(ERR, "Failed to create xsk socket.\n");
-		goto err;
+		goto out_umem;
 	}
 
 	/* insert the xsk into the xsks_map */
@@ -1331,7 +1331,7 @@ xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 					  &rxq->xsk_queue_idx, &fd, 0);
 		if (err) {
 			AF_XDP_LOG(ERR, "Failed to insert xsk in map.\n");
-			goto err;
+			goto out_xsk;
 		}
 	}
 
@@ -1339,7 +1339,7 @@ xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 	ret = rte_pktmbuf_alloc_bulk(rxq->umem->mb_pool, fq_bufs, reserve_size);
 	if (ret) {
 		AF_XDP_LOG(DEBUG, "Failed to get enough buffers for fq.\n");
-		goto err;
+		goto out_xsk;
 	}
 #endif
 
@@ -1347,20 +1347,21 @@ xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 		ret = configure_preferred_busy_poll(rxq);
 		if (ret) {
 			AF_XDP_LOG(ERR, "Failed configure busy polling.\n");
-			goto err;
+			goto out_xsk;
 		}
 	}
 
 	ret = reserve_fill_queue(rxq->umem, reserve_size, fq_bufs, &rxq->fq);
 	if (ret) {
-		xsk_socket__delete(rxq->xsk);
 		AF_XDP_LOG(ERR, "Failed to reserve fill queue.\n");
-		goto err;
+		goto out_xsk;
 	}
 
 	return 0;
 
-err:
+out_xsk:
+	xsk_socket__delete(rxq->xsk);
+out_umem:
 	if (__atomic_sub_fetch(&rxq->umem->refcnt, 1, __ATOMIC_ACQUIRE) == 0)
 		xdp_umem_destroy(rxq->umem);
 
-- 
2.25.1

Re: [PATCH 1/2] net/af_xdp: ensure xsk is deleted on Rx queue setup error

[Ferruh Yigit]

On 2/18/2022 11:20 AM, Ciara Loftus wrote:
> The Rx queue setup can fail for many reasons eg. failure to setup the
> custom program, failure to allocate or reserve fill queue buffers,
> failure to configure busy polling etc. When a failure like one of these
> occurs, if the xsk is already set up it should be deleted before
> returning. This commit ensures this happens.
> 
> Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
> Fixes: 288a85aef192 ("net/af_xdp: enable custom XDP program loading")
> Fixes: 055a393626ed ("net/af_xdp: prefer busy polling")
> Fixes: 01fa83c94d7e ("net/af_xdp: workaround custom program loading")
> Cc:stable@dpdk.org
> 
> Signed-off-by: Ciara Loftus<ciara.loftus@intel.com>

Series applied to dpdk-next-net/main, thanks.