[PATCH net-next v6 3/4] bnxt_en: Resize RSS contexts on channel count change
From: Björn Töpel <bjorn@kernel.org>
Date: 2026-03-18 12:26:26
Also in:
linux-kselftest, linux-rdma, lkml
Subsystem:
broadcom bnxt_en 50 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Michael Chan, Pavan Chebbi, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
bnxt_set_channels() previously rejected channel changes that alter the RSS table size when RSS contexts exist, because non-default context sizes were locked at creation. Replace the rejection with the new resize helpers. RSS table size only changes on P5 chips with older firmware; newer firmware always uses the largest table size. Signed-off-by: Björn Töpel <bjorn@kernel.org> --- .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 35 +++++++++++++++---- 1 file changed, 28 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 48e8e3be70d3..b87ac2bb43dd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c@@ -942,6 +942,7 @@ static int bnxt_set_channels(struct net_device *dev, { struct bnxt *bp = netdev_priv(dev); int req_tx_rings, req_rx_rings, tcs; + u32 new_tbl_size = 0, old_tbl_size; bool sh = false; int tx_xdp = 0; int rc = 0;
@@ -977,19 +978,33 @@ static int bnxt_set_channels(struct net_device *dev, tx_xdp = req_rx_rings; } - if (bnxt_get_nr_rss_ctxs(bp, req_rx_rings) != - bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings) && - (netif_is_rxfh_configured(dev) || bp->num_rss_ctx)) { - netdev_warn(dev, "RSS table size change required, RSS table entries must be default (with no additional RSS contexts present) to proceed\n"); - return -EINVAL; - } - rc = bnxt_check_rings(bp, req_tx_rings, req_rx_rings, sh, tcs, tx_xdp); if (rc) { netdev_warn(dev, "Unable to allocate the requested rings\n"); return rc; } + /* RSS table size only changes on P5 chips with older firmware; + * newer firmware always uses the largest table size. + */ + if (bnxt_get_nr_rss_ctxs(bp, req_rx_rings) != + bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings)) { + new_tbl_size = bnxt_get_nr_rss_ctxs(bp, req_rx_rings) * + BNXT_RSS_TABLE_ENTRIES_P5; + old_tbl_size = bnxt_get_rxfh_indir_size(dev); + + if (!ethtool_rxfh_indir_can_resize(dev, bp->rss_indir_tbl, + old_tbl_size, + new_tbl_size)) { + netdev_warn(dev, "RSS table resize not possible\n"); + return -EINVAL; + } + + rc = ethtool_rxfh_ctxs_can_resize(dev, new_tbl_size); + if (rc) + return rc; + } + if (netif_running(dev)) { if (BNXT_PF(bp)) { /* TODO CHIMP_FW: Send message to all VF's
@@ -999,6 +1014,12 @@ static int bnxt_set_channels(struct net_device *dev, bnxt_close_nic(bp, true, false); } + if (new_tbl_size) { + ethtool_rxfh_indir_resize(dev, bp->rss_indir_tbl, + old_tbl_size, new_tbl_size); + ethtool_rxfh_ctxs_resize(dev, new_tbl_size); + } + if (sh) { bp->flags |= BNXT_FLAG_SHARED_RINGS; bp->rx_nr_rings = channel->combined_count;
--
2.53.0