This is a note to let you know that I've just added the patch titled
bnxt_en: Flush XDP for bnxt_poll_nitroa0()'s NAPI
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bnxt_en-flush-xdp-for-bnxt_poll_nitroa0-s-napi.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1e409a540871dbd4b7e0ef513e92ed44ac58c075
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Mon Sep 18 17:36:10 2023 +0200
bnxt_en: Flush XDP for bnxt_poll_nitroa0()'s NAPI
[ Upstream commit edc0140cc3b7b91874ebe70eb7d2a851e8817ccc ]
bnxt_poll_nitroa0() invokes bnxt_rx_pkt() which can run a XDP program
which in turn can return XDP_REDIRECT. bnxt_rx_pkt() is also used by
__bnxt_poll_work() which flushes (xdp_do_flush()) the packets after each
round. bnxt_poll_nitroa0() lacks this feature.
xdp_do_flush() should be invoked before leaving the NAPI callback.
Invoke xdp_do_flush() after a redirect in bnxt_poll_nitroa0() NAPI.
Cc: Michael Chan <michael.chan@xxxxxxxxxxxx>
Fixes: f18c2b77b2e4e ("bnxt_en: optimized XDP_REDIRECT support")
Reviewed-by: Andy Gospodarek <gospo@xxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Reviewed-by: Michael Chan <michael.chan@xxxxxxxxxxxx>
Acked-by: Jesper Dangaard Brouer <hawk@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 931bb40ac05b5..4cb22e4060520 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -2520,6 +2520,7 @@ static int bnxt_poll_nitroa0(struct napi_struct *napi, int budget)
struct rx_cmp_ext *rxcmp1;
u32 cp_cons, tmp_raw_cons;
u32 raw_cons = cpr->cp_raw_cons;
+ bool flush_xdp = false;
u32 rx_pkts = 0;
u8 event = 0;
@@ -2554,6 +2555,8 @@ static int bnxt_poll_nitroa0(struct napi_struct *napi, int budget)
rx_pkts++;
else if (rc == -EBUSY) /* partial completion */
break;
+ if (event & BNXT_REDIRECT_EVENT)
+ flush_xdp = true;
} else if (unlikely(TX_CMP_TYPE(txcmp) ==
CMPL_BASE_TYPE_HWRM_DONE)) {
bnxt_hwrm_handler(bp, txcmp);
@@ -2573,6 +2576,8 @@ static int bnxt_poll_nitroa0(struct napi_struct *napi, int budget)
if (event & BNXT_AGG_EVENT)
bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
+ if (flush_xdp)
+ xdp_do_flush();
if (!bnxt_has_work(bp, cpr) && rx_pkts < budget) {
napi_complete_done(napi, rx_pkts);
