git: e4b9ac53e3ae - stable/13 - ixgbe: improve Atom C3000 SWFW semaphore acq

The branch stable/13 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=e4b9ac53e3ae3d8c36d8a19e5ed826bcac90faa4

commit e4b9ac53e3ae3d8c36d8a19e5ed826bcac90faa4
Author:     Barbara Skobiej <barbara.skobiej@intel.com>
AuthorDate: 2024-09-20 03:29:36 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2024-09-27 03:40:32 +0000

    ixgbe: improve Atom C3000 SWFW semaphore acq
    
    DPDK commit message
    
    net/ixgbe/base: improve SWFW semaphore acquisition
    HWSW semaphore acquisition in Atom C3000 NIC is a two stage process.
    Each time two semaphore acquisitions are required. Each second semaphore
    failure requires re-acquisition of first semaphore. This patch decouples
    the two acquisitions preventing potentially hundreds of thousands
    of unnecessary loop iterations.
    
    Signed-off-by: Barbara Skobiej <barbara.skobiej@intel.com>
    
    Obtained from:  DPDK (99f960c)
    
    (cherry picked from commit cc9944183187308a71489651b11342d293aac7d1)
---
 sys/dev/ixgbe/ixgbe_x550.c | 41 ++++++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

diff --git a/sys/dev/ixgbe/ixgbe_x550.c b/sys/dev/ixgbe/ixgbe_x550.c
index 275a3ff8c808..2c9ead8fd247 100644
--- a/sys/dev/ixgbe/ixgbe_x550.c
+++ b/sys/dev/ixgbe/ixgbe_x550.c
@@ -4242,36 +4242,39 @@ static s32 ixgbe_acquire_swfw_sync_X550a(struct ixgbe_hw *hw, u32 mask)
 
 	DEBUGFUNC("ixgbe_acquire_swfw_sync_X550a");
 
-	while (--retries) {
-		status = IXGBE_SUCCESS;
-		if (hmask)
-			status = ixgbe_acquire_swfw_sync_X540(hw, hmask);
-		if (status) {
-			DEBUGOUT1("Could not acquire SWFW semaphore, Status = %d\n",
-				  status);
-			return status;
-		}
-		if (!(mask & IXGBE_GSSR_TOKEN_SM))
-			return IXGBE_SUCCESS;
+	status = IXGBE_SUCCESS;
+	if (hmask)
+		status = ixgbe_acquire_swfw_sync_X540(hw, hmask);
+
+	if (status) {
+		DEBUGOUT1("Could not acquire SWFW semaphore, Status = %d\n", status);
+		return status;
+	}
+
+	if (!(mask & IXGBE_GSSR_TOKEN_SM))
+		return IXGBE_SUCCESS;
 
+	while (--retries) {
 		status = ixgbe_get_phy_token(hw);
-		if (status == IXGBE_ERR_TOKEN_RETRY)
-			DEBUGOUT1("Could not acquire PHY token, Status = %d\n",
-				  status);
 
 		if (status == IXGBE_SUCCESS)
 			return IXGBE_SUCCESS;
 
-		if (hmask)
-			ixgbe_release_swfw_sync_X540(hw, hmask);
-
 		if (status != IXGBE_ERR_TOKEN_RETRY) {
-			DEBUGOUT1("Unable to retry acquiring the PHY token, Status = %d\n",
-				  status);
+			DEBUGOUT1("Retry acquiring the PHY token failed, Status = %d\n", status);
+			if (hmask)
+				ixgbe_release_swfw_sync_X540(hw, hmask);
 			return status;
 		}
+
+		if (status == IXGBE_ERR_TOKEN_RETRY)
+			DEBUGOUT1("Could not acquire PHY token, Status = %d\n",
+				  status);
 	}
 
+	if (hmask)
+		ixgbe_release_swfw_sync_X540(hw, hmask);
+
 	DEBUGOUT1("Semaphore acquisition retries failed!: PHY ID = 0x%08X\n",
 		  hw->phy.id);
 	return status;