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[v6,bpf-next,09/24] xsk: discard zero length descriptors in Tx path

Message ID 20230714113640.556893-10-maciej.fijalkowski@intel.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series xsk: multi-buffer support | expand

Checks

Context Check Description
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Commit Message

Fijalkowski, Maciej July 14, 2023, 11:36 a.m. UTC 
From: Tirthendu Sarkar <tirthendu.sarkar@intel.com>

Descriptors with zero length are not supported by many NICs. To preserve
uniform behavior discard any zero length desc as invvalid desc.

Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 net/xdp/xsk_queue.h | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index 5752c9fd8ce7..bac32027f865 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -140,6 +140,9 @@  static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool,
 {
 	u64 offset = desc->addr & (pool->chunk_size - 1);
 
+	if (!desc->len)
+		return false;
+
 	if (offset + desc->len > pool->chunk_size)
 		return false;
 
@@ -156,6 +159,9 @@  static inline bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool,
 {
 	u64 addr = xp_unaligned_add_offset_to_addr(desc->addr);
 
+	if (!desc->len)
+		return false;
+
 	if (desc->len > pool->chunk_size)
 		return false;