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authorAlex Maftei (amaftei) <amaftei@solarflare.com>2020-01-10 16:28:07 +0300
committerDavid S. Miller <davem@davemloft.net>2020-01-10 22:24:37 +0300
commit960f16275bdf87d7bef59e5d446d0a2913b5f24a (patch)
tree638243be05667adfce5308f8ee61e3da75ac6f61 /drivers/net/ethernet/sfc/rx_common.c
parent88f7df35ceac7bdd4db33ceefcb1fe0b90112cda (diff)
downloadlinux-960f16275bdf87d7bef59e5d446d0a2913b5f24a.tar.xz
sfc: move RSS code
Style fixes included. Signed-off-by: Alexandru-Mihai Maftei <amaftei@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/rx_common.c')
-rw-r--r--drivers/net/ethernet/sfc/rx_common.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c
index 9c545d873d91..cdf21e2d5610 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -551,3 +551,68 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf,
napi_gro_frags(napi);
}
+
+/* RSS contexts. We're using linked lists and crappy O(n) algorithms, because
+ * (a) this is an infrequent control-plane operation and (b) n is small (max 64)
+ */
+struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx)
+{
+ struct list_head *head = &efx->rss_context.list;
+ struct efx_rss_context *ctx, *new;
+ u32 id = 1; /* Don't use zero, that refers to the master RSS context */
+
+ WARN_ON(!mutex_is_locked(&efx->rss_lock));
+
+ /* Search for first gap in the numbering */
+ list_for_each_entry(ctx, head, list) {
+ if (ctx->user_id != id)
+ break;
+ id++;
+ /* Check for wrap. If this happens, we have nearly 2^32
+ * allocated RSS contexts, which seems unlikely.
+ */
+ if (WARN_ON_ONCE(!id))
+ return NULL;
+ }
+
+ /* Create the new entry */
+ new = kmalloc(sizeof(*new), GFP_KERNEL);
+ if (!new)
+ return NULL;
+ new->context_id = EFX_EF10_RSS_CONTEXT_INVALID;
+ new->rx_hash_udp_4tuple = false;
+
+ /* Insert the new entry into the gap */
+ new->user_id = id;
+ list_add_tail(&new->list, &ctx->list);
+ return new;
+}
+
+struct efx_rss_context *efx_find_rss_context_entry(struct efx_nic *efx, u32 id)
+{
+ struct list_head *head = &efx->rss_context.list;
+ struct efx_rss_context *ctx;
+
+ WARN_ON(!mutex_is_locked(&efx->rss_lock));
+
+ list_for_each_entry(ctx, head, list)
+ if (ctx->user_id == id)
+ return ctx;
+ return NULL;
+}
+
+void efx_free_rss_context_entry(struct efx_rss_context *ctx)
+{
+ list_del(&ctx->list);
+ kfree(ctx);
+}
+
+void efx_set_default_rx_indir_table(struct efx_nic *efx,
+ struct efx_rss_context *ctx)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(ctx->rx_indir_table); i++)
+ ctx->rx_indir_table[i] =
+ ethtool_rxfh_indir_default(i, efx->rss_spread);
+}