@@ -967,6 +967,8 @@ struct bnx2x {
dma_addr_t qm_mapping;
#endif
+ int dropless_fc;
+
int dmae_ready;
/* used to synchronize dmae accesses */
struct mutex dmae_mutex;
@@ -101,6 +101,10 @@ static int int_mode;
module_param(int_mode, int, 0);
MODULE_PARM_DESC(int_mode, " Force interrupt mode (1 INT#x; 2 MSI)");
+static int dropless_fc;
+module_param(dropless_fc, int, 0);
+MODULE_PARM_DESC(dropless_fc, " Pause on exhausted host ring");
+
static int poll;
module_param(poll, int, 0);
MODULE_PARM_DESC(poll, " Use polling (for debug)");
@@ -2368,7 +2372,7 @@ static void bnx2x_link_attn(struct bnx2x *bp)
if (bp->link_vars.link_up) {
/* dropless flow control */
- if (CHIP_IS_E1H(bp)) {
+ if (CHIP_IS_E1H(bp) && bp->dropless_fc) {
int port = BP_PORT(bp);
u32 pause_enabled = 0;
@@ -6358,9 +6362,6 @@ static int bnx2x_init_port(struct bnx2x *bp)
REG_WR(bp, NIG_REG_LLH0_BRB1_DRV_MASK_MF + port*4,
(IS_E1HMF(bp) ? 0x1 : 0x2));
- /* support pause requests from USDM, TSDM and BRB */
- REG_WR(bp, NIG_REG_LLFC_EGRESS_SRC_ENABLE_0 + port*4, 0x7);
-
{
REG_WR(bp, NIG_REG_LLFC_ENABLE_0 + port*4, 0);
REG_WR(bp, NIG_REG_LLFC_OUT_EN_0 + port*4, 0);
@@ -8676,6 +8677,11 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
bp->dev->features |= NETIF_F_LRO;
}
+ if (CHIP_IS_E1(bp))
+ bp->dropless_fc = 0;
+ else
+ bp->dropless_fc = dropless_fc;
+
bp->mrrs = mrrs;
bp->tx_ring_size = MAX_TX_AVAIL;
When a given ring is running out of space, the FW can send pause towards the network. When working with multi-queues, when one queue is getting out of space it can block all other queues. The preferred scheme is to send pause frames only when running out of the shared internal chip buffers and if a given queue cannot place a packet on the host, it will drop it. Since some users might want to work in drop-less mode, allowing changing the behavior as a module parameter. Signed-off-by: Eilon Greenstein <eilong@broadcom.com> --- drivers/net/bnx2x.h | 2 ++ drivers/net/bnx2x_main.c | 14 ++++++++++---- 2 files changed, 12 insertions(+), 4 deletions(-)