From: Michael Chan <michael.chan@broadcom•com>
To: davem@davemloft•net
Cc: netdev@vger•kernel.org, Martin KaFai Lau <kafai@fb•com>
Subject: [PATCH net-next 06/11] bnxt_en: Improve -ENOMEM logic in NAPI poll loop.
Date: Mon, 28 Aug 2017 13:40:30 -0400 [thread overview]
Message-ID: <1503942035-24924-7-git-send-email-michael.chan@broadcom.com> (raw)
In-Reply-To: <1503942035-24924-1-git-send-email-michael.chan@broadcom.com>
If we cannot allocate RX buffers in the NAPI poll loop when processing
an RX event, the current code does not count that event towards the NAPI
budget. This can cause us to potentially loop forever in NAPI if we
consistently cannot allocate new buffers. Improve it by counting
-ENOMEM event as 1 towards the NAPI budget.
Cc: Martin KaFai Lau <kafai@fb•com>
Signed-off-by: Michael Chan <michael.chan@broadcom•com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 1afb408..a34fcdd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1850,6 +1850,13 @@ static int bnxt_poll_work(struct bnxt *bp, struct bnxt_napi *bnapi, int budget)
&event);
if (likely(rc >= 0))
rx_pkts += rc;
+ /* Increment rx_pkts when rc is -ENOMEM to count towards
+ * the NAPI budget. Otherwise, we may potentially loop
+ * here forever if we consistently cannot allocate
+ * buffers.
+ */
+ else if (rc == -ENOMEM)
+ rx_pkts++;
else if (rc == -EBUSY) /* partial completion */
break;
} else if (unlikely((TX_CMP_TYPE(txcmp) ==
--
1.8.3.1
next prev parent reply other threads:[~2017-08-28 17:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-28 17:40 [PATCH net-next 00/11] bnxt_en: Updates Michael Chan
2017-08-28 17:40 ` [PATCH net-next 01/11] bnxt_en: Update firmware interface spec. to 1.8.1.4 Michael Chan
2017-08-28 17:40 ` [PATCH net-next 02/11] bnxt_en: Improve tx ring reservation logic Michael Chan
2017-08-28 17:40 ` [PATCH net-next 03/11] bnxt_en: assign CPU affinity hints to bnxt_en IRQs Michael Chan
2017-08-28 17:40 ` [PATCH net-next 04/11] bnxt: Add PCIe device IDs for bcm58802/bcm58808 Michael Chan
2017-08-28 17:40 ` [PATCH net-next 05/11] bnxt: initialize board_info values with proper enums Michael Chan
2017-08-28 17:40 ` Michael Chan [this message]
2017-08-28 19:05 ` [PATCH net-next 06/11] bnxt_en: Improve -ENOMEM logic in NAPI poll loop Martin KaFai Lau
2017-08-28 17:40 ` [PATCH net-next 07/11] bnxt_en: Reduce default rings on multi-port cards Michael Chan
2017-08-28 17:40 ` [PATCH net-next 08/11] bnxt_en: fix clearing devlink ptr from bnxt struct Michael Chan
2017-08-28 17:40 ` [PATCH net-next 09/11] bnxt_en: bnxt: add TC flower filter offload support Michael Chan
2017-09-11 13:36 ` Jiri Pirko
[not found] ` <CAKvpyk1iV4z_f7cUA8DL1nU772hPtiZC4MtjA9t=S5J=8EcD-A@mail.gmail.com>
2017-09-18 9:52 ` Jiri Pirko
2017-08-28 17:40 ` [PATCH net-next 10/11] bnxt_en: add TC flower offload flow_alloc/free FW cmds Michael Chan
2017-08-28 17:40 ` [PATCH net-next 11/11] bnxt_en: add code to query TC flower offload stats Michael Chan
2017-08-28 23:57 ` [PATCH net-next 00/11] bnxt_en: Updates David Miller
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