From: Suman Ghosh <sumang@marvell.com>
Date: Thu, 13 Feb 2025 05:31:39 +0000 (+0530)
Subject: octeontx2-pf: Reconfigure RSS table after enabling AF_XDP zerocopy on rx queue
X-Git-Tag: v6.15-rc1~160^2~299^2~2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=25b07c1a869457fb1fcbbb744123d4ab05666709;p=thirdparty%2Fkernel%2Flinux.git

octeontx2-pf: Reconfigure RSS table after enabling AF_XDP zerocopy on rx queue

RSS table needs to be reconfigured once a rx queue is enabled or
disabled for AF_XDP zerocopy support. After enabling UMEM on a rx queue,
that queue should not be part of RSS queue selection algorithm.
Similarly the queue should be considered again after UMEM is disabled.

Signed-off-by: Suman Ghosh <sumang@marvell.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 92b0dba07853a..6f7c11d59942f 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -331,6 +331,10 @@ int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id)
 	rss_ctx = rss->rss_ctx[ctx_id];
 	/* Get memory to put this msg */
 	for (idx = 0; idx < rss->rss_size; idx++) {
+		/* Ignore the queue if AF_XDP zero copy is enabled */
+		if (test_bit(rss_ctx->ind_tbl[idx], pfvf->af_xdp_zc_qidx))
+			continue;
+
 		aq = otx2_mbox_alloc_msg_nix_aq_enq(mbox);
 		if (!aq) {
 			/* The shared memory buffer can be full.
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 2d53dc77ef1ef..010385b299886 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -910,8 +910,12 @@ static int otx2_get_rxfh(struct net_device *dev,
 		return -ENOENT;
 
 	if (indir) {
-		for (idx = 0; idx < rss->rss_size; idx++)
+		for (idx = 0; idx < rss->rss_size; idx++) {
+			/* Ignore if the rx queue is AF_XDP zero copy enabled */
+			if (test_bit(rss_ctx->ind_tbl[idx], pfvf->af_xdp_zc_qidx))
+				continue;
 			indir[idx] = rss_ctx->ind_tbl[idx];
+		}
 	}
 	if (rxfh->key)
 		memcpy(rxfh->key, rss->key, sizeof(rss->key));
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
index 894c1e0aea6f1..3bdee1603facc 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_xsk.c
@@ -130,6 +130,8 @@ int otx2_xsk_pool_enable(struct otx2_nic *pf, struct xsk_buff_pool *pool, u16 qi
 
 	set_bit(qidx, pf->af_xdp_zc_qidx);
 	otx2_clean_up_rq(pf, qidx);
+	/* Reconfigure RSS table as 'qidx' cannot be part of RSS now */
+	otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP);
 	/* Kick start the NAPI context so that receiving will start */
 	return otx2_xsk_wakeup(pf->netdev, qidx, XDP_WAKEUP_RX);
 }
@@ -146,6 +148,8 @@ int otx2_xsk_pool_disable(struct otx2_nic *pf, u16 qidx)
 	otx2_clean_up_rq(pf, qidx);
 	clear_bit(qidx, pf->af_xdp_zc_qidx);
 	xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING);
+	/* Reconfigure RSS table as 'qidx' now need to be part of RSS now */
+	otx2_set_rss_table(pf, DEFAULT_RSS_CONTEXT_GROUP);
 
 	return 0;
 }