netdev - [RFC bpf-next v2 13/14] bnxt: Introduce bnxt_xdp_buff wrapper for xdp

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Date:   Thu,  3 Nov 2022 20:25:31 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org
Subject: [RFC bpf-next v2 13/14] bnxt: Introduce bnxt_xdp_buff wrapper for xdp_buff

No functional changes. Boilerplate to allow stuffing more data after xdp_buff.

Cc: John Fastabend <john.fastabend@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: Anatoly Burakov <anatoly.burakov@...el.com>
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
Cc: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: Maryam Tahhan <mtahhan@...hat.com>
Cc: xdp-hints@...-project.net
Cc: netdev@...r.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 04cf7684f1b0..b2e0607a6400 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1789,6 +1789,10 @@ static void bnxt_deliver_skb(struct bnxt *bp, struct bnxt_napi *bnapi,
 	napi_gro_receive(&bnapi->napi, skb);
 }
 
+struct bnxt_xdp_buff {
+	struct xdp_buff xdp;
+};
+
 /* returns the following:
  * 1       - 1 packet successfully received
  * 0       - successful TPA_START, packet not completed yet
@@ -1812,7 +1816,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	bool xdp_active = false;
 	dma_addr_t dma_addr;
 	struct sk_buff *skb;
-	struct xdp_buff xdp;
+	struct bnxt_xdp_buff bxbuf;
 	u32 flags, misc;
 	void *data;
 	int rc = 0;
@@ -1922,9 +1926,9 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	dma_addr = rx_buf->mapping;
 
 	if (bnxt_xdp_attached(bp, rxr)) {
-		bnxt_xdp_buff_init(bp, rxr, cons, &data_ptr, &len, &xdp);
+		bnxt_xdp_buff_init(bp, rxr, cons, &data_ptr, &len, &bxbuf.xdp);
 		if (agg_bufs) {
-			u32 frag_len = bnxt_rx_agg_pages_xdp(bp, cpr, &xdp,
+			u32 frag_len = bnxt_rx_agg_pages_xdp(bp, cpr, &bxbuf.xdp,
 							     cp_cons, agg_bufs,
 							     false);
 			if (!frag_len) {
@@ -1937,7 +1941,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 	}
 
 	if (xdp_active) {
-		if (bnxt_rx_xdp(bp, rxr, cons, xdp, data, &len, event)) {
+		if (bnxt_rx_xdp(bp, rxr, cons, bxbuf.xdp, data, &len, event)) {
 			rc = 1;
 			goto next_rx;
 		}
@@ -1952,7 +1956,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 					bnxt_reuse_rx_agg_bufs(cpr, cp_cons, 0,
 							       agg_bufs, false);
 				else
-					bnxt_xdp_buff_frags_free(rxr, &xdp);
+					bnxt_xdp_buff_frags_free(rxr, &bxbuf.xdp);
 			}
 			cpr->sw_stats.rx.rx_oom_discards += 1;
 			rc = -ENOMEM;
@@ -1983,10 +1987,10 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 				goto next_rx;
 			}
 		} else {
-			skb = bnxt_xdp_build_skb(bp, skb, agg_bufs, rxr->page_pool, &xdp, rxcmp1);
+			skb = bnxt_xdp_build_skb(bp, skb, agg_bufs, rxr->page_pool, &bxbuf.xdp, rxcmp1);
 			if (!skb) {
 				/* we should be able to free the old skb here */
-				bnxt_xdp_buff_frags_free(rxr, &xdp);
+				bnxt_xdp_buff_frags_free(rxr, &bxbuf.xdp);
 				cpr->sw_stats.rx.rx_oom_discards += 1;
 				rc = -ENOMEM;
 				goto next_rx;
-- 
2.38.1.431.g37b22c650d-goog