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sfc: check hash is valid before using it

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On EF100, the RX hash field in the packet prefix may not be valid (e.g.
 if the header parse failed), and this is indicated by a one-bit flag
 elsewhere in the packet prefix.  Only call skb_set_hash() if the
 RSS_HASH_VALID bit is set.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2020-08-14 13:26:22 +01:00 committed by David S. Miller
parent e591d298cc
commit 068885434c
5 changed files with 18 additions and 1 deletions
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5
drivers/net/ethernet/sfc/ef100_rx.c
View File

@ -31,6 +31,11 @@
#define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_WIDTH \
ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_WIDTH
bool ef100_rx_buf_hash_valid(const u8 *prefix)
{
return PREFIX_FIELD(prefix, RSS_HASH_VALID);
}
static bool check_fcs(struct efx_channel *channel, u32 *prefix)
{
u16 rxclass;

1
drivers/net/ethernet/sfc/ef100_rx.h
View File

@ -14,6 +14,7 @@
#include "net_driver.h"
bool ef100_rx_buf_hash_valid(const u8 *prefix);
void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event);
void ef100_rx_write(struct efx_rx_queue *rx_queue);
void __ef100_rx_packet(struct efx_channel *channel);

8
drivers/net/ethernet/sfc/efx.h
View File

@ -45,6 +45,14 @@ static inline void efx_rx_flush_packet(struct efx_channel *channel)
__ef100_rx_packet, __efx_rx_packet,
channel);
}
static inline bool efx_rx_buf_hash_valid(struct efx_nic *efx, const u8 *prefix)
{
if (efx->type->rx_buf_hash_valid)
return INDIRECT_CALL_1(efx->type->rx_buf_hash_valid,
ef100_rx_buf_hash_valid,
prefix);
return true;
}
/* Maximum number of TCP segments we support for soft-TSO */
#define EFX_TSO_MAX_SEGS 100

2
drivers/net/ethernet/sfc/net_driver.h
View File

@ -1265,6 +1265,7 @@ struct efx_udp_tunnel {
* @rx_write: Write RX descriptors and doorbell
* @rx_defer_refill: Generate a refill reminder event
* @rx_packet: Receive the queued RX buffer on a channel
* @rx_buf_hash_valid: Determine whether the RX prefix contains a valid hash
* @ev_probe: Allocate resources for event queue
* @ev_init: Initialise event queue on the NIC
* @ev_fini: Deinitialise event queue on the NIC
@ -1409,6 +1410,7 @@ struct efx_nic_type {
void (*rx_write)(struct efx_rx_queue *rx_queue);
void (*rx_defer_refill)(struct efx_rx_queue *rx_queue);
void (*rx_packet)(struct efx_channel *channel);
bool (*rx_buf_hash_valid)(const u8 *prefix);
int (*ev_probe)(struct efx_channel *channel);
int (*ev_init)(struct efx_channel *channel);
void (*ev_fini)(struct efx_channel *channel);

3
drivers/net/ethernet/sfc/rx_common.c
View File

@ -525,7 +525,8 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf,
return;
}
if (efx->net_dev->features & NETIF_F_RXHASH)
if (efx->net_dev->features & NETIF_F_RXHASH &&
efx_rx_buf_hash_valid(efx, eh))
skb_set_hash(skb, efx_rx_buf_hash(efx, eh),
PKT_HASH_TYPE_L3);
if (csum) {