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bnxt_en: Fix trimming of P5 RX and TX rings

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The recent commit to trim the RX and TX rings on P5 chips by assigning
each with max CP rings divided by 2 is not correct.  Max CP rings
divided by 2 may be bigger than the original RX or TX and would
lead to failure.  In other words, we may be checking for increased
RX/TX rings than required and it may fail.

Fix it by calling __bnxt_trim_rings() instead that would properly
trim RX and TX without the possibility of increasing their values.

Fixes: f5b29c6afe ("bnxt_en: Add helper to get the number of CP rings required for TX rings")
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231212005122.2401-2-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Chan 2023-12-11 16:51:10 -08:00 committed by Jakub Kicinski
parent 79ac113933
commit f1e50b276d
1 changed files with 11 additions and 5 deletions
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16
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View file

@ -6489,6 +6489,8 @@ static void bnxt_hwrm_ring_free(struct bnxt *bp, bool close_path)
}
}
static int __bnxt_trim_rings(struct bnxt *bp, int *rx, int *tx, int max,
bool shared);
static int bnxt_trim_rings(struct bnxt *bp, int *rx, int *tx, int max,
bool shared);
@ -6532,8 +6534,9 @@ static int bnxt_hwrm_get_rings(struct bnxt *bp)
if (bp->flags & BNXT_FLAG_AGG_RINGS)
rx >>= 1;
if (cp < (rx + tx)) {
rx = cp / 2;
tx = rx;
rc = __bnxt_trim_rings(bp, &rx, &tx, cp, false);
if (rc)
return rc;
if (bp->flags & BNXT_FLAG_AGG_RINGS)
rx <<= 1;
hw_resc->resv_rx_rings = rx;
@ -13885,9 +13888,12 @@ static void _bnxt_get_max_rings(struct bnxt *bp, int *max_rx, int *max_tx,
if (bp->flags & BNXT_FLAG_AGG_RINGS)
*max_rx >>= 1;
if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) {
if (*max_cp < (*max_rx + *max_tx)) {
*max_rx = *max_cp / 2;
*max_tx = *max_rx;
int rc;
rc = __bnxt_trim_rings(bp, max_rx, max_tx, *max_cp, false);
if (rc) {
*max_rx = 0;
*max_tx = 0;
}
/* On P5 chips, max_cp output param should be available NQs */
*max_cp = max_irq;